The layers that make up the Earth's atmosphere has unique properties that influence the kinds of wavelengths that are reflected, absorbed, or permitted to pass through to the planet's surface. Three layers are troposphere, stratosphere, and mesosphere.
The troposphere, the first layer closest to the surface of the planet, is where the majority of the planet's weather is found. The temperature in this layer drops with altitude, and it is made up of greenhouse gases like carbon dioxide and water vapor.
The stratosphere, which contains the ozone layer, is the next layer. The sun's dangerous UV light is absorbed by ozone, keeping it from reaching the surface of the Earth.
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If a compound has a molecular formula of N2O2, then its empirical mass is
..........g/mol.
The empirical mass of the compound, given that the molecular formula of the compound is N₂O₂, is 60 g/mol
How do i determine the empirical mass of the compound?First, we must understand here that empirical mass of a compound is simply the molar mass of the compound.
This means that if we obtain the molar mass of a compound, then we have equally obtain the empirical mass of the compound.
Now, we shall obtain the molar mass of the compound. Details below:
Molar mass of N = 14 g/molMolar mass of O = 16 g/molMolar mass of N₂O₂ = ?Molar mass of N₂O₂ = (14 × 2) + (16 × 2)
Molar mass of N₂O₂ = 28 + 32
Molar mass of N₂O₂ = 60 g/mol
From the above, the molar mass of the compound is 60 g/mol
Thus, we can conclude that the empirical mass of the compound is 60 g/mol
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A simple calorimeter can be used to measure temperature change in a closed
system during a reaction. An increase in temperature during the reaction MUST
indicate which of the following?
A. The reaction causes a rise in heat capacity.
B. The reaction generates an electrical current.
C. The reaction releases chemical energy.
D. The reaction involves a state change.
Submit
An increase in temperature during the reaction is an indication that the reaction released chemical energy
Increase in temperature during reactionsThe increase in temperature during a reaction in a closed system indicates that the reaction releases chemical energy.
This is because an increase in temperature indicates that energy is being released into the surroundings, and the only way that can happen in a closed system is if it is released by the reaction taking place within the system.
In other words, the correct answer is C. The reaction releases chemical energy.
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Which color on the visible light spectrum has more energy than green?
Orange
Cyan
Yellow
Red
Answer:
Cyan is the color on the visible light spectrum that has more energy than green
Explanation:
Green's energy is 2.25,
Orange's energy is 2.06,
Cyan's energy is 2.48,
Yellow's energy is 2.14,
Red's energy is from 1.77 to 1.91,
After each event listed, indicate how the concentration of each species in the chemical equation will change to reach equilibrium. An up arrow indicates an increase in concentration, a down arrow indicates a decrease in concentration, and leaving it blank means there is no change in the concentration.
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2CO(g)
+
O2(g)
↽−−⇀
2CO2(g)
increasing the concentration of CO
increasing the concentration of CO2
decreasing the volume of the system
When the volume of the system is decreased, the pressure will increase, causing the reaction to shift in the direction that produces fewer gas molecules. In this case, the reaction shifts towards the formation of CO2, increasing the concentration of all species (CO, O2, and CO2).
After each event listed, the changes in concentration for each species to reach equilibrium can be determined:
Increasing the concentration of CO:
CO will decrease (↓)
O2 will not change (blank)
CO2 will increase (↑)
Increasing the concentration of CO2:
CO will not change (blank)
O2 will not change (blank)
CO2 will increase (↑)
Decreasing the volume of the system:
CO will increase (↑)
O2 will increase (↑)
CO2 will increase (↑)
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Urgent help pleasee
Question 8 (1 point)
What is the pressure of a gas that originally occupied 2.7 L at a pressure of 3.4 atm,
if the volume is increased to 10.0 L?
Your Answer:
Answer
units
13 atm
Explanation:Ideal gas laws let us calculate different values for gases.
Boyle's Law
One of the ideal gas laws is Boyle's law. Boyle's law states that pressure and volume are inversely proportional. This means that as pressure increases, volume decreases and vice versa. In equation form, Boyle's law is:
P₁V₁ = P₂V₂This means to find the original pressure, all we have to do is plug in the known values and solve for P₁.
Solving for P
Firstly, let's plug in the known volumes and pressure.
P₁ * 2.7L = 3.4atm * 10.0LThen, divide both sides by 2.7 to find the original pressure.
P₁ ≈ 12.59 atmSince this equation is based on measured values, we should round to significant figures. Rounded to 2 sig figs, the original pressure was 13 atm.
which element in group 6A is not found as the central atom in compounds with an expanded valence shell
Question 4 (1 point)
3 HCIO --> 2 HCIO 2 + HCI
Which of the following statements best describes the above chemical equation?
No. The total number of Cl atoms is not balanced.
No. The number of O atoms is not balanced.
No. The total number of H atoms is not balanced.
Yes, there are the same number of atoms of each element on both the reactant
and product sides of the equation.
A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides. Here the number of O atoms is not balanced. The correct option is B.
A balanced chemical equation is one in which the number of atoms on each side (the reactant and product side) of the equation are equal. The law of conservation of mass states that when a chemical reaction takes place, the mass of the reactants and products should be equal.
Each element has the same number of atoms as before the chemical reaction. Therefore, the chemical equation must be in equilibrium.
Here the balanced equation is:
3 HCIO → HCIO ₃ + 2HCI
Thus the correct option is B.
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the half-life constant of a first order reaction is 12 minutes. if the initial concentration of reactant is 0.352M, it takes ___ minutes for it to decrease to 0.176M
The half-life constant of a first order reaction is 12 minutes. if the initial concentration of reactant is 0.352M, it takes 12 minutes for it to decrease to 0.176M
What is half-life of a substance?The duration it takes for half of the radioactive atoms in a sample to decay is known as the half-life in the context of radioactive decay. Because they are unstable, radioactive substances spontaneously undergo radioactive decay, changing over time into new elements or isotopes.
A radioactive substance's half-life is one of its distinctive characteristics. For instance, if the half-life of a radioactive isotope is one hour, half of the initial quantity would have degraded after one hour, half of the remaining quantity would have degraded after another hour, and so on.
The duration it takes for the concentration of a reactant to reduce by half in a first-order reaction is known as the half-life in the context of chemical reactions.
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what is chemical bonding
Answer:It is when two different chemicals bond together
Explanation:
Answer: Chemical bonding is the attraction between two or more atoms that allows them to be able to form a stable chemical compound.
Explanation: The specific nature of a chemical bond can vary, but the most commonly known are covalent and ionic bonds. With these bonds, it provides sufficient energy between atoms when one has less. It’s the force of attraction that holds atoms, allowing the electrons to form a bond together.
Weight is best defined as _____. A the amount of space an object takes up B the speed of an object C the force of gravity on an object D the amount of energy in an object
Weight is best defined as the force of gravity on an object (option C).
What is weight?Weight is the force on an object due to the gravitational attraction between it and the Earth (or whatever astronomical object it is primarily influenced by).
Weight is different from mass being that weight is a dependent on the gravitational force of the object's habitation, however, mass is not.
For example, the mass of an object on Earth can be 10kg, however, the weight of the object is 100N because the gravitational force of the Earth is 10m/s².
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Test
A sample of A was heated
in a dry test tube. Pieces of
moist red and blue litmus
paper were held at the
mouth of the tube
Sodium hydroxide
solution was added
dropwise to a solution of
A until in excess
A few drops of barium
chloride solution were
added to a solution of A
followed by some dilute
hydrochloric acid
Observations
the red litmus paper turned
blue. While the blue litmus
paper remained blue.
Which ion (s) may be present
ion present
the gas given off is
a green precipitate formed
ion is present
the precipitate remained in Fe³+ (aq) + 3OH- (aq) Fe(OH)3 (s)
excess
a white precipitate formed.
the precipitate remained in
the dilute acid.
ion is present
Ba2+ (aq) + SO42- (aq) → BaSO4(s)
The identifications of any other ions that may be present remain inconclusive.
Based on the observations mentioned, we can deduce the possible ions present in the substance A and the respective reactions involved.
1. Heating in dry tube with blue and red litmus paper - There was no reaction as the blue litmus paper remained blue, indicating that the substance is not acidic and the red litmus paper turned blue, indicating that the substance is basic. Therefore, the substance could be a base or a neutral substance.
2. Addition of sodium hydroxide solution - The addition of NaOH dropwise to A resulted in the further alkalization of the substance if it was initially a base. No gas was evolved during this reaction. The reaction could be represented as follows:
A + NaOH → A⁻ + Na⁺ + H₂O
Here, A could be a metal cation or the conjugate base of an organic acid.
3. Addition of barium chloride solution followed by dilute hydrochloric acid - The addition of a few drops of barium chloride solution to A would test for the presence of sulphate ion (SO₄²⁻). The white precipitate that formed in dilute hydrochloric acid solution that remained is barium sulphate (BaSO₄) as per the following equation:
Ba²⁺ + SO₄²⁻ → BaSO₄(s)
4. Green precipitate formed - No information is provided on which ions may be present that produced a green precipitate.
Based on the given observations, the substance A is most likely a base or neutral substance that did not evolve any gas upon the addition of NaOH. The presence of the sulphate ion (SO₄²⁻) was confirmed later by the formation of a white precipitate of BaSO₄ that remained unchanged in dilute hydrochloric acid solution. However, the identifications of any other ions that may be present remain inconclusive.
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The equation below represents a chemical reaction at 1 atm and 298 K. N2(g) + 3H2(g) -+ 2NH3(g) State the change in energy that occurs in order to break the bonds in the hydrogen molecules
To break the bonds in the hydrogen molecules in the reaction N2(g) + 3H2(g) → 2NH3(g), approximately 1305 kJ of energy needs to be supplied.
In order to break the bonds in the hydrogen molecules (H2), energy needs to be supplied to overcome the attractive forces between the atoms within the molecules. Breaking bonds requires an input of energy and is an endothermic process.
In the given chemical reaction, N2(g) + 3H2(g) → 2NH3(g), the hydrogen molecules (H2) are broken as the reactants, N2 and H2, are converted into ammonia (NH3).
Breaking one H2 molecule requires the energy equivalent to the bond dissociation energy (also known as bond energy) of the H-H bond. The bond dissociation energy is the energy required to break one mole of a particular bond in a gaseous molecule.
The bond dissociation energy for the H-H bond is approximately 435 kJ/mol. This means that it takes approximately 435 kJ of energy to break one mole of H-H bonds.
In the given reaction, three moles of H2 molecules are involved. Therefore, the total energy required to break the bonds in the hydrogen molecules is:
Energy required = 3 moles * 435 kJ/mol = 1305 kJ
So, to break the bonds in the hydrogen molecules in the reaction N2(g) + 3H2(g) → 2NH3(g), approximately 1305 kJ of energy needs to be supplied.
It's important to note that breaking bonds requires energy input, while forming bonds releases energy. In this reaction, the formation of new bonds in the ammonia (NH3) molecules will release energy, resulting in an overall exothermic reaction. The energy change of the reaction, often referred to as the enthalpy change (ΔH), will depend on the difference between the energy required to break the bonds and the energy released when new bonds are formed.
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KCIO3 -> KCI + 02
How many moles of KCI are produced if 6743 grams of KCIO3 decomposes?
55.03 moles of KCI are produced when 6743 grams of [tex]KClO_{3}[/tex] decomposes
To determine the number of moles of KCl produced when 6743 grams of [tex]KClO_{3}[/tex] decomposes, we need to use the concept of molar mass and the balanced chemical equation.
First, let's calculate the molar mass of [tex]KClO_{3}[/tex]
The molar mass of potassium (K) is approximately 39.10 g/mol.
The molar mass of chlorine (Cl) is approximately 35.45 g/mol.
The molar mass of oxygen (O) is approximately 16.00 g/mol.
So, the molar mass of [tex]KClO_{3}[/tex] is:
(39.10 g/mol) + (35.45 g/mol) + (3 * 16.00 g/mol) = 122.55 g/mol.
Now, we need to calculate the number of moles of [tex]KClO_{3}[/tex]:
Number of moles = Mass / Molar mass
Number of moles = 6743 g / 122.55 g/mol = 55.03 mol.
According to the balanced chemical equation:
2[tex]KClO_{3}[/tex] -> 2 KCl + 3 O2,
we can see that for every 2 moles of [tex]KClO_{3}[/tex], we obtain 2 moles of KCl.
Therefore, the number of moles of KCl produced will be equal to the number of moles of [tex]KClO_{3}[/tex] since the ratio is 1:1. Thus, 55.03 moles of KCl will be produced.
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Unit:Stoichiometry Multi-Step Problems -WS #3 answer key
Explanation:
You've not brought out the question
What type of reaction?
HCN,Na2So4
Mg3N2
Co2, H2O
Cu,Zn(NO3)2
Na,N2
HCN, Na2SO4: Combination of compounds.
Mg3N2: Chemical compound.
CO2, H2O: Dissolution or hydration reaction.
Cu, Zn(NO3)2: Single-replacement reaction.
Na, N2: Combination of elements.
Let's analyze each chemical combination to determine the type of reaction involved:
HCN, Na2SO4:
The combination of hydrogen cyanide (HCN) and sodium sulfate (Na2SO4) does not represent a specific chemical reaction. It is simply the combination of two compounds.
Mg3N2:
Mg3N2 represents a chemical compound, magnesium nitride. It does not indicate a specific reaction.
CO2, H2O:
The combination of carbon dioxide (CO2) and water (H2O) represents a chemical reaction known as hydration or dissolution. When carbon dioxide dissolves in water, it forms carbonic acid (H2CO3), which can further dissociate into hydrogen ions (H+) and bicarbonate ions (HCO3-).
Cu, Zn(NO3)2:
The combination of copper (Cu) and zinc nitrate (Zn(NO3)2) represents a single-replacement reaction. Copper displaces zinc from the compound, resulting in the formation of copper nitrate (Cu(NO3)2) and zinc metal (Zn).
Na, N2:
The combination of sodium (Na) and nitrogen gas (N2) does not represent a specific reaction. It is simply the combination of two elements.
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How many particles of silver chloride are produced
The produce 1 mole of AgCl, we would have approximately 6.022 × 10^23 particles of silver chloride.
To determine the number of particles of silver chloride produced, we need to consider the balanced chemical equation and the stoichiometry of the reaction involved.
The balanced chemical equation for the formation of silver chloride (AgCl) is:
2 AgNO3 + NaCl → AgCl + 2 NaNO3
From the equation, we can see that two moles of silver nitrate (AgNO3) react with one mole of sodium chloride (NaCl) to produce one mole of silver chloride (AgCl).
To calculate the number of particles, we need to know the number of moles of silver chloride. Let's assume that we have 'x' moles of AgCl.
According to the balanced equation, the molar ratio between AgCl and AgNO3 is 1:2. So, if 'x' moles of AgCl are produced, then '2x' moles of AgNO3 must react.
Now, if we know the molar mass of AgCl, we can convert the moles of AgCl to particles using Avogadro's number (6.022 × 10^23 particles/mol).
To provide an accurate answer in 125 words, I'll need to make some assumptions. Let's assume we have 1 mole of AgCl. Then, the number of particles of AgCl would be:
1 mole AgCl × (6.022 × 10^23 particles/mol) = 6.022 × 10^23 particles.
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Complete Question
How many grams of silver chloride are produced from 5.0 g of silver nitrate reacting with an excess of barium chloride in the reaction
2AgNO3 +BaCl2 →2AgCl +Ba(NO3)2?
How many grams of a 25% (m/m) sodium chloride solution contain 0.250 moles of sodium chloride?
Approximately 1.167 grams of the 25% (m/m) NaCl solution would contain 0.250 moles of sodium chloride.
To determine the mass of a 25% (m/m) sodium chloride (NaCl) solution containing 0.250 moles of sodium chloride, we need to consider the concentration and molar mass of NaCl.
The percentage (m/m) concentration indicates the mass of solute (NaCl) present per 100 grams of the solution. Therefore, a 25% (m/m) NaCl solution contains 25 grams of NaCl per 100 grams of the solution.
First, we calculate the mass of NaCl in the given solution:
Mass of NaCl = (25% / 100%) x Mass of solution
= (25 / 100) x Mass of solution
Next, we can determine the mass of the solution required to have 0.250 moles of NaCl using the molar mass of NaCl, which is approximately 58.44 g/mol.
Mass of NaCl = Moles x Molar mass
Mass of solution x (25 / 100) = 0.250 moles x 58.44 g/mol
Now, we can solve for the mass of the solution:
Mass of solution = (0.250 moles x 58.44 g/mol) / (25 / 100)
= 1.167 g
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Help is needed in chemistry plss
The chemical equations are as completed below:
1. N₂ + 3 H₂ → 2 NH₃
2. 2 KClO₃ → 2 KCl + 3 O₂
What is the complete forms of these chemical equations?The complete chemical equations are as follows:
3. 2 NaCl + F₂ → 2 NaF + Cl₂
4. 2 H₂ + O₂ → 2 H₂O
5. Pb(OH)₂ + 2 HCl → 2 H₂O + PbCl₂
6. 3 ABr₂ + K₂SO4 → 2 KBr + Al₂(SO4)₃
7. CH₄ + 2 O₂ → CO₂ + 2 H₂O
8. C₃H₂ + ⁵/₂ O₂ → 3 CO₂ + H₂O
9. C₃H₁₂ + ⁹/₂ O₂ → 3 CO₂ + 6 H₂O
10. FeCl₃ + 3 NaOH → Fe(OH)₃ + 3 NaCl
11. 4 P + 3 O₂ → 2 P₂O₃
12. 2 Na + 2 H₂O → 2 NaOH + H₂
13. 2 Ag₂O → 4 Ag + O2
14. S₄ + 6 O₂ → 4 SO₃
15. C₃H₈O + 5 O₂ → 3 CO₂ + 4 H₂O
16. 2 K + MgBr₂ → 2 KBr + Mg
17. 2 HCl + CaCO₃ → CaCl₂ + H₂O + CO₂
18. HNO₃ + NaHCO₃ → NaNO₃ + H₂O + CO₂
19. 2 H₂O + O₂ → 2 H₂O₂
20. 2 NaBr + CaF₂ → 2 NaF + CaBr₂
21. H₂SO₄ + 2 NaNO₂ → 2 HNO₂ + Na₂SO₄
Therefore, the correct answer is as given above. It could then be concluded that the above chemical equations are now balanced.
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NACIO3 → NaCl + O₂
3: How many total atoms are on
the reactants side of the
equation?
7
Answer:
lalala
Explanation:
The balanced chemical equation is:
NaIO3 → NaCl + 1.5 O2
On the reactants side of the equation, there are:
- 1 Na atom
- 1 I atom
- 3 O atoms
Total number of atoms on the reactants side = 1 + 1 + 3 = 5
Therefore, there are a total of 5 atoms on the reactants side of the equation. This differs from the answer provided in the question (which says 7), which may be due to an error.
In the given chemical equation there is 1 reactant and thus the total atoms which are on the reactants side of the equation are 5.
Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
There is 1 reactant and thus the total atoms which are on the reactants side of the equation are 5.
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Mention one structural difference between oligosaccharides and polysaccharides.
One structural difference between oligosaccharides and polysaccharides is the number of monosaccharide units they consist of. Oligosaccharides have a relatively small number of monosaccharide units (typically 3 to 10), while polysaccharides have a larger number of monosaccharide units (often hundreds or thousands).
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The temperature of a 75.0 gram sample of water drops from 15°C to 8°C. Calculate how
much heat was transferred, and state whether it was gained or lost based on the sign of your
answer.
Q=
Gained or Lost:
PLEASE HELP!!!!
Q ≈ -2000 J
Explanation:Temperature changes can be used to calculate heat transfer. Please note that since the question is based on measured values I rounded for significant figures.
Heat Transfer
In heat transfer, energy can be gained or lost. When energy is gained, temperature increases. However, when energy is lost, temperature decreases. Since the water decreased in temperature, it must have lost energy. This means that Q will be negative. Q represents the transfer of energy, which is measured in joules.
Calculating Energy
To calculate heat transfer we can use the equation q = m·c·ΔT.
m is the mass of the sample in gramsc is specific heat in joules per gram·celsiusΔT is the change in temperature in celsiusFor this question, we know that the mass is 75.0g. Specific heat is a constant that every substance has. These values can be found in data tables. For liquid water, c = 4.184. Finally, the change in temperature is -7°C.
Q = 75.0g · 4.184 J/g·C · -7°CQ = -2196.6In this scenario, 2196.6 joules of energy were lost. Since -7 has one sig fig, this answer can be rounded to 2000 J.
Exercise 8 If 46.0g of CH₂ reacts with 32.0g O. According to the following reactio CH₂ + 20₂ - CO₂ + 2H₂O a. Which substance is limiting reactant? b. How many grams of it remain unreacted? c. How many grams of CO₂ would be produced?
Answer:
limiting reagent is 02
mass of CO2 is 11g
Explanation:
the limiting reagent is the reagent which is consumed completely
no of mole of CH2 = m in g / molar mass
= 46.0/(12+2)
= 3.285 moles.
no of mole of O2 = 32/32
= 1 mole
from the reaction
1 mole of CH2 ==> 2 mol of O2
3.285 mol ==> 1/2 mol
3.285 mol ==> 0.5 mol
:. since O2 has the lowest mol , it's the limiting reagent
the limiting reagent mol will be used to find the no of mole of CH2
2 mol of O2==> 1 mol of CO2
0.5 mol ==> 0.5/2
0.25 mole of CO2
mass = 0.25 * ( 12+32)
= 11g
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PLEASE HELP THIS IS DUE IN 10 MORE MINUTES I WILL GIVE YOU 30 POINTS ANSWER THE QUESTIONS BELOW AND THE QUESTION IN THE IMAGE!
1. Light always travels in a straight line until something gets in its way.
True or False
2. Waves carry energy. The amount of energy they carry is related to their frequency and their amplitude.
True or False
3.The higher the frequency of a wave, the more energy, and the higher the amplitude of a wave, the more energy.
True or False
It is true that Light always travels in a straight line until something gets in its way.
Waves do carry energy. The energy carried by a wave is directly related to both its frequency and amplitude. Higher frequency waves have more energy, and larger amplitude waves also carry more energy.
The frequency of a wave is related to its energy, but the amplitude of a wave is not directly proportional to its energy. The energy of a wave is determined solely by its frequency, not its amplitude.
The amplitude of a wave corresponds to its maximum displacement from the equilibrium position, while the energy of a wave is determined by the number of wave oscillations or cycles per unit time, which is represented by the frequency.
Thus, the answers are true, true and false respectively.
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Arrange the different types of radioactive decay in increasing order of their ability to penetrate substances.
Drag each tile to the correct box.
Tiles
gamma raybeta particlealpha particle
The alpha particles have the lowest penetrating power, followed by beta particles, while gamma rays possess the highest ability to penetrate substances.
In increasing order of their ability to penetrate substances, the different types of radioactive decay are:
Alpha particle: Alpha particles consist of two protons and two neutrons and are relatively large and heavy. Due to their size and positive charge, they have limited penetrating power and can be easily stopped by a sheet of paper or a few centimeters of air.
Beta particle: Beta particles are high-energy electrons (beta-minus decay) or positrons (beta-plus decay) emitted during radioactive decay. They have greater penetrating power than alpha particles but are still relatively easily stopped by a few millimeters of aluminum or a few meters of air.
Gamma ray: Gamma rays are electromagnetic waves with high energy and frequency. They have the highest penetrating power among the three types of radioactive decay. Gamma rays require thick layers of dense materials such as lead or concrete to significantly reduce their intensity.
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CH4 + H2O -H2 + CO2
to
Given Units___
Unknown Units___
How many grams of CO₂ are produced of 3.4 moles of CH4 are burned?
Answer:
149.63 grams of CO2 are produced when 3.4 moles of CH4 are burned.
If 1.2 kilograms of rust form on a bridge in five days, what should be the rate of reaction in grams per hour? (Recall that a bar over the number means that zero is significant.) 0 0.05 g/hr 0 0.010 g/hr 0 100 ghr O 10 g/hr
pls help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
The artificial transmutation is described as process which leads to the formation of a new element with a different atomic number mass number.
The example can be seen in the artificial transmutation of nitrogen-14 where alpha particles are bombarded to create oxygen-17 .
What is the benefit of artificial transmutation?The artificial transmutation of transuranic elements has is very beneficial as it has helped to manage radioactive waste.
The artificial transmutation of nitrogen-14 where alpha particles are bombarded to create oxygen-17 and a proton is shown in the reaction below:
14N + 4He → 17O + 1H
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what is the concentration of H+ in pH 3 moldm^-3
Answer:
0.001 mol/dm^3.
Explanation:
The pH of a solution is defined as the negative base-10 logarithm of the concentration of hydrogen ions (H+) in moles per liter (M).
The pH of 3 moldm^-3 means the concentration of hydrogen ions in the solution is:
[H+] = 10^(-pH) mol/L
[H+] = 10^(-3) mol/dm^3
[H+] = 0.001 mol/dm^3
Therefore, the concentration of H+ in pH 3 moldm^-3 is 0.001 mol/dm^3.
What is rust say a scientific answer
1. For the reaction: CH3CO₂H(1) → CH4(g) + CO₂(g)
a. Calculate the entropy, enthalpy and free energy change for the reaction under standard conditions.
b. Calculate the minimum temperature (°C) at which the reaction is spontaneous.
c. Calculate the equilibrium constant at standard conditions.
To calculate the entropy (ΔS), enthalpy (ΔH), and free energy change (ΔG) for the reaction under standard conditions, we can use the given values:
ΔH = ΣH(products) - ΣH(reactants)
= (-74.8 kJ/mol + 0 kJ/mol) - (-487.0 kJ/mol)
= 412.2 kJ/mol
ΔS = ΣS(products) - ΣS(reactants)
= (213.6 J/(mol K) + 0 J/(mol K)) - (159.8 J/(mol K))
= 53.8 J/(mol K)
ΔG = ΔH - TΔS
= 412.2 kJ/mol - (298 K) * (53.8 J/(mol K) / (1000 J/kJ))
= 412.2 kJ/mol - 16.0 kJ/mol
= 396.2 kJ/mol
Therefore, under standard conditions, the values for the reaction are:
ΔH = 412.2 kJ/mol
ΔS = 53.8 J/(mol K)
ΔG = 396.2 kJ/mol
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