calculate the molarity of a solution prepared by mixing 100.0 ml of the solution made in number 3 with 900.0 ml of 0.0250 m nacl.

The number of moles of sodium hydroxide present in the sample, is 0.00839 moles.

To calculate the number of moles of sodium hydroxide present in a 26.80 ml sample of a 0.315 m solution, use the following equation:

Moles = concentration (M) x volume (L)

Moles = 0.315 M x 0.02680 L

Moles = 0.00839 moles of sodium hydroxide present in a 26.80 ml sample of a 0.315 m solution.

To explain this in further detail, moles are a unit of measurement for an amount of substance and are typically expressed as mol. A mole is equal to 6.02 x 10^23 atoms or molecules, and is represented by the letter 'n' or 'N'.

The concentration of a solution is a measure of the amount of solute dissolved in a given volume of solvent and is expressed in molarity (M). Volume is expressed in litres (L).

By multiplying the concentration of a solution (0.315 M) by the volume of the sample (0.02680 L).

Sodium hydroxide, also known as lye, is a highly reactive and caustic inorganic compound. It is commonly used in soap and detergent production, as well as in the paper and textile industries.

It is also used in the production of a variety of other chemicals, including pharmaceuticals and food additives.

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Answer:

Multiple scientists, including Albert Einstein, David Bohm, John Bell, and Roger Penrose, have challenged certain aspects of quantum theory due to differing views about particle behavior, hidden variables, and consciousness. Despite the challenges, quantum theory remains widely accepted as one of the most accurate and well-tested frameworks in modern physics.

In summary, the mass percent of the sulfuric acid solution is 29.89%, the molality is 4.35 mol/kg, and the normality is 7.5 N.

To calculate the mass percent, molality, and normality of the 3.75 M sulfuric acid solution, follow these steps:
First let's calculate the mass of 1 liter of the solution:
We know, Density = mass/volume. So, mass = density × volume = 1.230 g/mL × 1000 mL = 1230 g
Now, calculating the mass of sulfuric acid (H2SO4) in 1 liter of the solution:
Molarity = moles of solute/volume of solution. So moles of solute = molarity × volume = 3.75 mol/L × 1 L = 3.75 mol
The molar mass of H2SO4 = (2 × 1.01) + (32.07) + (4 × 16) = 98.08 g/mol
Mass of H2SO4 = moles × molar mass = 3.75 mol × 98.08 g/mol = 367.8 g
To Calculate the mass percent of H2SO4:
Mass percent = (mass of solute / mass of solution) × 100
= (367.8 g / 1230 g) × 100 = 29.89%
To Calculate the molality of H2SO4:
Molality = moles of solute / mass of solvent (in kg)
Mass of solvent = mass of solution - mass of solute = 1230 g - 367.8 g = 862.2 g = 0.8622 kg
Molality = 3.75 mol / 0.8622 kg = 4.35 mol/kg
To Calculate the normality of H2SO4:
Normality = molarity × number of equivalents per mole
For H2SO4, there are 2 acidic hydrogens (protons) that can be released, so the number of equivalents per mole = 2.
Normality = 3.75 M × 2 = 7.5 N
In summary, the mass percent of the sulfuric acid solution is 29.89%, the molality is 4.35 mol/kg, and the normality is 7.5 N.

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Homogeneous equilibrium: an equilibrium involving reactants and products in the same phase.  

Heterogeneous equilibrium: an equilibrium involving a catalyst in a different phase as the other species.  

Le Chatelier's Principle: if a chemical reaction is subjected to a change in conditions that displaces it from equilibrium, then the reaction adjusts toward a new equilibrium state.

The reaction proceeds in the direction that-at least partially-offsets the change in conditions. Complex ion: a metal ion bonded to Lewis acids or Lewis bases.

Homogeneous equilibrium occurs when the reactants and products of a reaction exist in the same phase, either solid, liquid, or gas. Heterogeneous equilibrium happens when the reactants and products are in different phases.

Le Chatelier's Principle states that if a chemical reaction is subjected to a change in conditions, the reaction will adjust towards a new equilibrium state in a way that offsets the change in conditions.

A complex ion is a metal ion bonded to Lewis acids or Lewis bases, which are molecules or ions with an extra pair of electrons that can be donated to other molecules or ions.

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Explanation:

If we look at the definition of the second electron affinity:

The second electron affinity is the enthalpy change when one mole of gaseous 2⁻ ions is formed from one mole of gaseous 1⁻ ions

The equations of the second electron affinity for oxygen and sulfur:

O⁻ (g) + e⁻ → O²⁻ (g)

S⁻ (g) + e⁻ → S²⁻ (g)

This process is endothermic as we are trying to combine an electron with a negative ion, and so we must overcome the repulsion. Applying energy will overcome it.

The second electron affinity is the energy change that occurs when an atom in the gaseous state gains an additional electron.

For both oxygen and sulfur, the second electron affinity values are unfavorable, meaning that the energy change that occurs is endothermic. This means that energy is being absorbed by the atom, and the atom is becoming more stable.
To understand why the second electron affinity values for oxygen and sulfur are unfavorable, it is important to look at the electron configurations of these atoms. Oxygen's electron configuration is 2s22p4, meaning it has 8 electrons in its outermost shell. Sulfur has an electron configuration of 2s22p63s2, meaning it has 16 electrons in its outer shell. Since both of these atoms have a full outer shell of electrons, they are not in need of an additional electron, and therefore do not have a strong tendency to gain one. As a result, it takes a lot of energy for the atom to gain an additional electron, meaning the second electron affinity value is unfavorable (endothermic).

In conclusion, the second electron affinity values for oxygen and sulfur are unfavorable (endothermic) because they already have full outer shells of electrons and do not have a strong tendency to gain an additional electron.

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v = 20/5

  = 4m/s

Velocity equals distance over time.

While calculating the mass for chloride, a student comes up with a negative number. The most likely the reason for this error, assuming they did the math correctly is that the student has used the wrong sign for the charge of the chloride ion.

Chloride is an anion, and its charge is negative, but the student may have used a positive sign while calculating it. For instance, the student may have assumed that the chloride ion has a charge of +1 instead of -1, which would have led to the negative mass value.

Besides that, there is no other reason for a negative mass value. The mass of a compound, such as chloride, is always positive and should not be negative at any time. Thus, it can be assumed that the student has made a mistake while assigning the sign for the charge of the chloride ion. However, it is essential to double-check the calculations to ensure that there are no other errors or mistakes in the calculations. Additionally, it is recommended to consult a teacher or a tutor for guidance in case of any confusion while calculating the mass of an ion or a compound.

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We will need 1.0 mol NaOH to react with 0.5 mol pf H2CO3.

Let's understand this in detail:

The balanced chemical equation of the neutralization reaction between H2CO3 and NaOH is

H2CO3 + 2NaOH ⟶ Na2CO3 + 2H2O.

We need to use the mole ratio from the balanced equation to determine how many moles of NaOH will react with 0.50 mol of H2CO3. We can see from the equation that 1 mole of H2CO3 reacts with 2 moles of NaOH.

Therefore, 0.50 mol of H2CO3 will react with

(2/1) x 0.50 = 1.0 mol of NaOH.

Answer: c. 1.0 mol NaOH.

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The layers of the sun can be seen in the image attached.

The sun is composed of several layers, including:

Core: The innermost layer of the sun where nuclear fusion takes place. The temperature in the core is about 15 million degrees Celsius.

Radiative Zone: This layer is between the core and the convection zone. Energy produced in the core is transported through the radiative zone by photons.

Convection Zone: The outermost layer of the sun's interior where hot gas rises and cooler gas sinks. The energy produced in the core is carried to the surface by convection.

Photosphere: The visible surface of the sun where most of the sun's light is emitted. The temperature of the photosphere is around 5,500 degrees Celsius.

Chromosphere: A thin layer above the photosphere that emits a reddish glow during solar eclipses. The temperature of the chromosphere ranges from 4,000 to 10,000 degrees Celsius.

Corona: The outermost layer of the sun's atmosphere, extending millions of kilometers into space. The temperature of the corona is extremely high, around 1 to 3 million degrees Celsius.

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The aldol reaction involves the reaction of an aldehyde or ketone with an enolate ion to form a β-hydroxyaldehyde or β-hydroxyketone, followed by a dehydration to form a double bond.

The aldol reaction is an important organic reaction in the formation of new carbon–carbon bonds. The reaction is named after the aldol reaction product, which contains both aldehyde and alcohol groups.

The aldol addition reaction has three mechanistic steps, which are deprotonation, nucleophilic attack, and protonation. These steps are explained below:

(1) Deprotonation: In the first step of the aldol reaction, the base removes a proton from the α-carbon of the carbonyl compound, which leads to the formation of the enolate ion.

The enolate ion is a resonance-stabilized anion that contains a negative charge on the oxygen atom and a double bond between the carbon and oxygen atoms.

(2) Nucleophilic attack: In the second step of the aldol reaction, the enolate ion acts as a nucleophile and attacks the carbonyl group of another molecule of the aldehyde or ketone.

This leads to the formation of a β-hydroxyaldehyde or β-hydroxyketone intermediate.

(3) Protonation: In the final step of the aldol reaction, the β-hydroxyaldehyde or β-hydroxyketone intermediate is protonated by the acid.

This leads to the formation of the aldol addition product, which contains a new carbon–carbon bond.

Thus, the aldol addition reaction involves three mechanistic steps, which are deprotonation, nucleophilic attack, and protonation.

These steps are essential for the formation of the aldol addition product, which contains a new carbon–carbon bond.

The aldol reaction is an important organic reaction that is widely used in the synthesis of natural products and pharmaceuticals.

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The pH of a solution if 10 ml of a 1 M HCl solution is added to 10 ml of a 1 M NaOH solution can be calculated as follows:

First, let's find the number of moles of HCl and NaOH in the solution. Number of moles of HCl = Concentration of HCl x Volume of HClNumber of moles of HCl = 1 M x (10 ml/1000 ml)Number of moles of HCl = 0.01 molesNumber of moles of NaOH = Concentration of NaOH x Volume of NaOHNumber of moles of NaOH = 1 M x (10 ml/1000 ml)Number of moles of NaOH = 0.01 molesNext, let's find the net number of moles of H+ and OH- ions.Number of moles of H+ ions = Number of moles of NaOH - Number of moles of HCl.Number of moles of H+ ions = 0.01 - 0.01Number of moles of H+ ions = 0 molesNumber of moles of OH- ions = Number of moles of HCl - Number of moles of NaOHNumber of moles of OH- ions = 0.01 - 0.01Number of moles of OH- ions = 0 molesSince the net number of moles of H+ ions and OH- ions is zero, the solution is neutral. The pH of a neutral solution is 7. Therefore, the pH of the solution is 7.

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The student obtained an optically active product after exposing r-1-bromo-2-propanol to sodium hydroxide. The proton NMR of the product is also provided.

The structure of the compound that the student isolated is:CH3 – CH (OH) – CH2 – Br

In the given compound r-1-bromo-2-propanol, the bromine atom is attached to the first carbon atom. When this compound is treated with sodium hydroxide, the hydroxide ion attacks the carbon atom attached to the bromine atom and forms a negatively charged oxygen atom.This negatively charged oxygen atom further attracts the proton of the adjacent carbon atom (second carbon atom). After the transfer of a proton, the negatively charged oxygen atom gets neutralized and an alkoxide ion is formed. This alkoxide ion further attacks the third carbon atom and the compound is formed.In the compound obtained, there is no plane of symmetry or center of symmetry. This makes the compound optically active.

Further, the proton NMR shows the presence of a singlet at chemical shift 1.1 ppm due to the presence of three equivalent methyl groups. The presence of a broad singlet at chemical shift 3.7 ppm is due to the presence of –OH group. The singlet at chemical shift 4.2 ppm is due to the presence of –CH2 group.The structure of the compound that the student isolated is CH3 – CH (OH) – CH2 – Br.

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The volume of 2.230 m sucrose containing 0.7718 moles sucrose is 2.922 ml.

The volume of 2.230 m sucrose containing 0.7718 moles sucrose can be calculated using the following equation:

Volume (ml) = (Molarity (m) x Volume (L)) / Moles (mol)

Therefore, Volume (ml) = (2.230 m x 1L) / 0.7718 mol

Volume (ml) = 2.922 ml

The volume of 2.230 m sucrose containing 0.7718 moles sucrose, the molarity of sucrose needs to be known. Molarity is the amount of a solute that is present in one liter of a solution.

Molarity is typically expressed in terms of moles per liter (m). To calculate the volume, the equation (Molarity x Volume) / Moles is used. In this equation, Molarity is 2.230 m, Volume is 1L, and Moles is 0.7718 mol.

When these values are plugged into the equation, the resulting volume is 2.922 ml.

The volume of 2.230 m sucrose containing 0.7718 moles sucrose is 2.922 ml.

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When animals consume food containing large polymeric molecules, such as proteins, carbohydrates, and nucleic acids, their digestive system breaks down these molecules into smaller components that can be absorbed and utilized by the body.

Mechanical digestion occurs in the mouth and stomach, where food is broken down into smaller pieces through chewing and mixing with digestive enzymes and acids. Chemical digestion occurs primarily in the small intestine, where enzymes and other compounds break down complex molecules into smaller components.

Proteins, for example, are broken down into their constituent amino acids by proteases, while carbohydrates are broken down into simple sugars like glucose and fructose by amylases. Nucleic acids are broken down into nucleotides by nucleases.

Once these molecules are broken down, they are absorbed into the bloodstream through the walls of the small intestine and transported to the liver, where they are further metabolized and distributed to other parts of the body as needed. The body then uses these molecules to build new proteins, carbohydrates, and nucleic acids or to generate energy through cellular respiration. Any excess molecules are typically stored for later use or eliminated from the body as waste.

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--The complete question is, What happens to large polymeric molecules in food once they are eaten by animals?--

The half-life of the isotope is 11.2 years.

The half-life of a radioactive isotope is the time it takes for half of the atoms in a sample to undergo radioactive decay. For a radioactive isotope with a decay rate of 6.2 percent per year, the half-life can be calculated as follows:

Half-life = ln(2) / (decay rate) = ln(2) / 0.062 = 11.2 years (rounded to the nearest tenth)

To understand this calculation in further detail, it is helpful to consider the concept of radioactive decay in terms of probability. After one half-life has elapsed, there is a 50 percent chance that an atom will have decayed, and a 50 percent chance that it will remain undecayed. After two half-lives have elapsed, there is a 75 percent chance that an atom will have decayed, and a 25 percent chance that it will remain undecayed.

This concept can be applied to the equation above, as the probability of decay during a single time interval is equal to the decay rate multiplied by the length of the time interval. By solving this equation, the half-life of a given radioactive isotope can be determined.

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Answer : When mixing 538 grams of a substance into 647 ml of water, the concentration of the resulting solution in g/L is 0.83.

The concentration of the resulting solution in g/L can be calculated by dividing the mass of the substance (538 g) by the total volume of the solution (647 ml). This gives us a result of 0.83 g/L.

To further explain this calculation, we must first understand the concepts of mass and volume. Mass is a measure of the amount of matter an object contains. Volume, on the other hand, is the amount of space occupied by a given object. When mixing 538 grams of a substance into 647 ml of water, we are creating a solution with a certain concentration of the substance.

To calculate the concentration of the resulting solution, we must divide the mass of the substance (538 g) by the total volume of the solution (647 ml). This gives us a result of 0.83 g/L.

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The nonzero quantity is Heat Transfer.

Heat Transfer is the only quantity that must be nonzero for a constant pressure process at 300K and 1 atm. This is because Heat Transfer is the amount of energy that is required to maintain constant pressure.

All other quantities in this process, such as Work, Internal Energy, and Enthalpy, are zero for a constant pressure process at a given temperature and pressure.

Therefore, the quantity that is nonzero for this constant pressure process at 300k and 1 atm is Heat Transfer.

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A  series of solutions with a range of precisely known analyte concentrations. Option D

A calibration curve is a graphical representation of the relationship between the concentration or amount of a substance, and a signal or measurement obtained from an analytical instrument or assay. The calibration curve is constructed by measuring the signal or response of the instrument or assay at different known concentrations or amounts of the substance, and plotting these values on a graph.

The resulting curve is then used to determine the concentration or amount of the substance in an unknown sample by measuring its signal or response and comparing it to the calibration curve.

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Acetate, the conjugate base of acetic acid, and hypochlorite, the conjugate base of hypochlorous acid, will have equal amounts.

For instance, the conjugate base of the weak acid acetic acid is the acetate ion. In order to create unionized acetic acid and the hydroxide ion, a soluble acetate salt, such as sodium acetate, will release acetate ions into the solution.

Acetic acid and hypochlorous acid will react when combined to produce their conjugate bases:

CH3COOH + HOCl ↔ CH3COO- + HClO

This reaction's equilibrium constant can be written as:

K = [CH3COO-][HClO] / [CH3COOH][HOCl]

[CH3COO-] = [CH3COOH] = 1.0 M

[HClO] = [HOCl] = 1.0 M

By entering these values as replacements in the equilibrium formula, we obtain:

K = (1.0 M) / (1.0 M)

= 1.0

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UV active compounds are those that fluoresce when exposed to a UV lamp. Upon exposure to UV light, these compounds absorb energy and promote an electron from the HOMO to the LUMO. Consider which wavelengths are included in the UV range. CH2=CH2, CH2=CH-CH=CH-CH=CH, CH2=CH-CH=CH-CH=CH-CH=CH, CH2=CH-CH2-

CH=CH, and CH, =CH-CH=CH are all examples of UV active compounds.


The UV active compounds in the given list are CH2=CH-CH=CH-CH=CH, CH2=CH-CH=CH-CH=CH-CH=CH, and CH2=CH-CH2-CH=CH. These compounds will **fluoresce** when exposed to a **UV lamp** and absorb energy to promote an electron from the HOMO to the LUMO.

To determine if a compound is UV active, consider the presence of **chromophores** within the molecule. Chromophores are functional groups that absorb UV light, typically containing conjugated double bonds or aromatic rings. In this case, the first three compounds have conjugated double bonds, making them UV active. The fourth compound, CH=CH-CH=CH, lacks sufficient conjugation to be UV active.

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2.27 M is the molarity of a solution made by dissolving 1.25moles of Na[tex]_2[/tex]CrO[tex]_4[/tex] in enough water to form exactly 0.550 l of solution.

A chemical solution's concentration is measured in molarity (M). It refers to the solute's moles per litre of solution. Keep in mind that this is not the same as solvent in litres (a common error). Although molarity is a useful unit, it does have one significant drawback. Temperature impacts a solution's volume, therefore when the temperature varies, it does not stay constant. Typically, you convert grammes of solute to moles and then divide this quantity by litres of solution because you cannot measure solute in moles physically.

Molarity = moles of solute/volume of solution in liters

Molarity = 1.25 moles/0.550 L = 2.27 M

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The half-life of the reaction with an initial concentration of 0.050 m is 16.9 minutes,

which is longer than the half-life of 10.0 minutes when the initial concentration was 0.250 m.

The half-life of a second-order reaction depends on the initial reactant concentration.

When the initial concentration of a reactant is higher, the half-life of the reaction will be shorter; when the initial concentration of a reactant is lower, the half-life of the reaction will be longer.

Therefore, if a second-order reaction has a half-life of 10.0 minutes when the initial reactant concentration is 0.250 m, the half-life when the initial concentration is 0.050 m would be longer than 10.0 minutes.

To determine the exact half-life of the reaction with the lower initial concentration, we can use the integrated rate law for a second-order reaction:

ln[A]t = -kt + ln[A]0

In this equation, A

is the initial concentration of the reactant; and k is the reaction rate constant.

The half-life of the reaction with an initial concentration of 0.050 m, we can rearrange the equation to solve for t, the time in which the reactant concentration decreases to half of the initial concentration:

t = -(1/k) ln[0.5A0]

The initial concentration of 0.050 m, solve for t to get the half-life of the reaction with the lower initial concentration:

t = -(1/k) ln[0.5(0.050)] = 16.9 minutes

Therefore, the half-life of the reaction with an initial concentration of 0.050 m is 16.9 minutes, which is longer than the half-life of 10.0 minutes when the initial concentration was 0.250 m.

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False: Lindeman's law of trophic efficiency, which says that the efficiency of energy transferred from one trophic level to the next higher trophic level is about 10%, states that the transfer of energy from one trophic level to the next trophic level follows a 10% rule.

Energy transfer between trophic levels is inefficient. Only 10% or so of the net output at one level carries over to the next level. Ecological pyramids are diagrams that show the flow of energy, the accumulation of biomass, and the quantity of organisms at various trophic levels.

The ten percentile rule is usually used to describe how energy is transferred between trophic groups. 90% of the initial energy from one trophic level to the next is inaccessible because it is used for activities like movement, growth, respiration, and reproduction.

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Answer:

Sublimation, the dry ice changes to a gas, solid to gas is sublimation

In the "Reactions" section of your Pre-lab notebook, you should have two reaction schemes involving the alkene. The correct answer is option d.

The Pre-lab notebook is a collection of worksheets and pre-lab assignments that students must finish before lab. This may include preparing solutions, making graphs, filling out data tables, or writing lab reports.A pre-lab notebook is a place where students may record and evaluate their work before and during a laboratory session. It is a document that is kept by the student and used to help them comprehend the material that is presented to them.

The Pre-lab notebook is divided into three sections: the Procedures section, the Data section, and the Reactions section. An alkene is a hydrocarbon that contains a carbon-carbon double bond. Alkenes are typically unsaturated and highly reactive. Alkenes are used in a variety of industries, including the production of plastics, synthetic rubbers, and fibers. Alkenes are also used as solvents in many applications.

They are known for their ability to react with a variety of other compounds. This will ensure you cover a range of possible reactions and provide a comprehensive understanding of the alkene's behavior in different situations.

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The value of the constant, k, for this data is 51.5.

option D.

To determine the constant k, we can use the formula:

PV = k

where;

We can rearrange the formula to solve for k:

k = PV

Now, we can multiply the pressure and volume values for each data point to get the corresponding value of k:

For the first data point: k = 1.15 kg/cm² x 44.8 mL = 51.52

For the second data point: k = 1.24 kg/cm² x 41.5 mL = 51.40

For the third data point: k = 1.47 kg/cm² x 35.0 mL = 51.45

We can take the average of these values to get an overall value for k:

k = (51.52 + 51.40 + 51.45) / 3 = 51.46 ≈ 51.5

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The reaction scheme is as follows:

Styrene (monomer) + Azobisisobutyronitrile (initiator) →  Radical polymers + Nitrile groups

Radical polymers then undergo combination or disproportionation as the possible modes of termination:

Combination:

Radical polymers + Radical polymers → Polystyrene (end product)

Disproportionation:

Radical polymers → Polystyrene + Styrene (monomer)

Polymerization of styrene is a chain-growth process initiated by thermolysis of azobisisobutyronitrile, which is a free radical initiator.

During the reaction, styrene molecules act as the monomers, while azobisisobutyronitrile molecules provide the initiating radicals, which combine to form a growing polymer chain.

These polymer chains can either terminate through combination, where two growing chains react with each other and form a new polymer chain, or through disproportionation,

where a growing polymer chain reacts with a styrene molecule to form a new polymer chain and a styrene molecule.

Thermolysis, which is the decomposition of molecules due to high temperature, is the mechanism of initiation of the polymerization of styrene.

This process breaks down the azobisisobutyronitrile molecules into the two radicals, which act as the initiators for the polymerization.

The two possible modes of termination, combination and disproportionation, then occur, resulting in the formation of polystyrene as the end product.

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The Arrhenius equation shows that the activation energy is directly proportional to the logarithm of the rate constant and inversely proportional to the temperature.

The Arrhenius equation is

[tex]k = A e^{-\frac{E_a}{RT}}[/tex]

where:

k is the rate constant is the pre-exponential factor

Ea is the activation energy

R is the gas constant

T is the temperature in Kelvin

According to the Arrhenius equation, as temperature increases, the rate constant, and thus the reaction rate increases exponentially. This is because as temperature increases, the average kinetic energy of the molecules in the reaction mixture increases, leading to a greater proportion of molecules with sufficient energy to react.

The activation energy of a reaction, Ea, is the minimum energy required for reactant molecules to react and form products. The Arrhenius equation shows that the activation energy is inversely proportional to the rate constant, and thus the reaction rate. As temperature increases, the proportion of reactant molecules with sufficient energy to overcome the activation energy barrier increases, reducing the activation energy and increasing the reaction rate.

Overall, the Arrhenius equation demonstrates that increasing temperature increases the reaction rate and decreases the activation energy.

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The number of grams of NaCl to add to raise the boiling point is:

86.12g.

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1.27 l of stock sulfuric acid should be diluted to 1.50 l with water in order to have a 0.750 m solution of sulfuric acid.

To make a 0.750 m solution of sulfuric acid, you need to dilute 18.0 m stock sulfuric acid with water to 1.50 l.

To make a 0.750 m solution of sulfuric acid, you need to start with 18.0 m stock sulfuric acid and dilute it with water to 1.50 l.

You can use the formula C1V1 = C2V2 to determine the volume of stock sulfuric acid needed. C1 represents the concentration of stock sulfuric acid (18.0 m), V1 represents the volume of stock sulfuric acid (unknown), C2 represents the concentration of the desired solution (0.750 m), and V2 represents the volume of the desired solution (1.50 l).

Plugging in the given values, you get (18.0 m)(V1) = (0.750 m)(1.50 l). Solving for V1, you get V1 = 1.27 l. Therefore, you need 1.27 l of stock sulfuric acid to make a 0.750 m solution of sulfuric acid with a total volume of 1.50 l.

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