Answer:
[tex]A,B\text{ and D}[/tex]Explanation:
Here, we want to select the possible problems with nuclear fusion
Nuclear fusion refers to a nuclear reaction wherein two or more daughter nuclei combines to give a larger nucleus
Let us look at the options one after the other to check which of them is correct
a) This is correct
The temperature accompanying nuclear reactions is millions of degrees celsius which are very high
b) This is Correct
This is the major reason why there are currently no nuclear reactors that use fusion to provide energy
c) This is wrong
They occur at very high temperatures. The nuclei need very high energy to send them into kinetic motion
d) This is correct
It is quite difficult to contain a fusion reaction due to the conditions surrounding it and that is one of the reasons why there are no commercial nuclear reactors that use fusion as an energy source
A 3.00 L sample of paint that has a density of 4.65 g/mL is found to contain 33.1 g lead (II) nitride. what is mass percentage of lead in the paint and what is the ppm?
Density relates the mass of a compound to its volume. We will first find the mass of the solution using the density and volume given. We have the following equation:
[tex]\rho=\text{ density = }\frac{Mass}{Volume}[/tex]We clear the mass,
[tex]\begin{gathered} Mass\text{ = }\rho\times Volume \\ Mass\text{ =}4.65\frac{g}{mL}\times3000mL \\ Mass\text{ =}13950\text{ g} \end{gathered}[/tex]So, the mass of paint is 13950 g. Now the mass percentage of the lead in the paint will be calculated as follows:
[tex]\begin{gathered} \%mass=\frac{\text{ Mass of lead (II) nitride}}{Mass\text{ of paint}}\times100 \\ \%mass=\frac{33.1\text{ g}}{13950\text{ g}}\times100 \\ \%mass=0.24\% \end{gathered}[/tex]The mass percentage of lead in the paint is 0.24%.
ppm concentration means the quantity of solute in milligrams (mg) is in a liter (L) of a solution. So, to calculate ppm concentration we will divide the milligrams of lead (II) nitride between the liters of paint:
[tex]\begin{gathered} \text{ppm = }\frac{\text{33.1g of lead}\times\frac{1000mg}{1g}}{3L} \\ \text{ppm =11033ppm of lead} \end{gathered}[/tex]The ppm of lead in the paint is 11033ppm.
What consists of water molecules that have escaped or evaporated from the body of water
Water molecules that have escaped or evaporated from the body of water then water get excited and they begin to gain kinetic energy
A water molecule has a three atom two hydrogen and one oxygen atom and that's why water is sometime refred to as H₂O and a single drop of water contain billion drop of molecule and evaporation is the process in which given to the change that occurs to a substance that changes it from its liquid state to a gaseous state
When water get evaporates the molecule of water in a glass will get excited and they begin to gain kinetic energy and vigorously hit the wall of glass
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How much water needs to be added to 65 mL of 3.0 M stock solution to produce a 1.0 M diluted solution?
To answer this question, we have to use the dilution rule, that is represented by the following equation:
[tex]C1V1=C2V2[/tex]Where C1 and C2 are the initial and final concentrations and V1 and V2 are the initial and final volumes.
Solve the equation for V2 to find the final volume:
[tex]\begin{gathered} V2=\frac{C1V1}{C2} \\ V2=\frac{3.0M\cdot65mL}{1.0M} \\ V2=195mL \end{gathered}[/tex]The final volume of the solutions has to be 195mL. Since we already have 65mL, we need to add 130mL of water to have 195mL in total.
It means that the correct answer is 130mL.
Katarina is a forensic scientist who finds a stain at a crime scene. What is the first thing she should do?
A.
Build a small frame around the area.
B.
Scrape the substance into a plastic bag.
C.
Make a sketch of the stain in a notepad.
D.
Determine if the substance is blood.
When Katarina finds a stain at a crime scene the first thing she should do is to scrape the substance into a plastic bag. That is option B.
Who is a forensic scientist?A forensic scientist is a professionally trained individual that applies their knowledge in the field of criminology by using evidence found on the crime scene to narrow down a suspect.
When a stain is being noticed by the forensic scientist, the first step should be to secure the stain for further investigation.
To secure the stain, the scientist should scrap the stain into a plastic bag and this should be taken to the laboratory for further evaluation and investigation.
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What is the pH of a 0.670 M solution of Ca(NO₂)₂ (Ka of HNO₂ is 4.5 × 10⁻⁴)?
The pH of a 0.670 M solution of Ca(NO₂)₂ is 1.76
When HNO₂ dissociates, it forms H⁺ and NO₂⁻ ions.
HNO₂ ==> H⁺ + NO₂⁻
Ka of HNO₂ = [H⁺] [NO₂⁻] / [HNO₂] = 4.5× 10⁻⁴
Let’s take x for unknown
4.5 x 10⁻⁴ = (x)(x) / 0.670
4.5 x 10⁻⁴ = x² / 0.670
x² = 3.015 x 10⁻⁴
x = 1.74 x 10⁻²
[H⁺] = 1.74 x 10⁻² M
pH is the measurement of the acidity or basicity of a compound. It ranges from 0 to 14
Therefore, the pH of a 0.670 M solution of Ca(NO₂)₂ is
pH = -log [H⁺]
pH = -log 1.74 x 10⁻²
pH = 1.76
The pH of a 0.670 M solution of Ca(NO₂)₂ is 1.76 which lies in the acidic range (0 to 7)
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What is the Organic compound shown? A) PropyneB) 1-ButeneC) 1-ButyneD) Acetylene
ANSWER
1-Butyne
STEP-BY-STEP EXPLANATION:
To name the below structure, we need to consider the following
0. The number of carbon atoms present in the structure
,1. The type of bond and the location
According to the structure given, we have four carbon atoms
These four carbon atoms mean Butane according to the alkane family
We have a tripple bond in between the first and second carbon atom
Since we have a tripple bond, the -ane in butane will be changed to -yne
Hence, the name of the structure is 1-Butyne
A student has a sample of 1.31 moles of fluorine gas that is contained in a 24.6 L container at 336 K. What is the pressure of the sample? The ideal gas constant is 0.0821 L*atm/mol*K. Round your answer to the nearest 0.01 and include units.
Answer
The pressure of the sample is 1.47 atm
Explanation
Given:
Moles, n = 1.31 mol
Volume, V = 24.6 L
Temperature, T = 336 K
The ideal gas constant, R = 0.0821 L*atm/mol*K
What to find:
Pressure, P of the sample.
Step-by-step solution:
Pressure, P of the sample can be calculated using the ideal gas equation.
[tex]\begin{gathered} PV=nRT \\ \\ \Rightarrow P=\frac{nRT}{V} \end{gathered}[/tex]Put the values of the parameters into the formula, we have;
[tex]P=\frac{1.31mol\times0.0821\text{ }L.atm/mol.K\times336K}{24.6\text{ }L}=1.47\text{ }atm[/tex]The pressure of the sample is 1.47 atm
If I begin with 13.5G of aluminum. How much will I need? I picked B but I’m not sure if I’m correct
Explanation:
Aluminum will react with chlorine gas according to the following reaction:
2 Al (s) + 3 Cl₂ (g) ----> 2 AlCl₃
We have to find the mass of Cl₂ that will completely react with 13.5 g of Al. First we have to convert the mass of Al to moles using its molar mass.
molar mass of Al = 26.98 g/mol
moles of Al = 13.5 g * 1 mol/(26.98 g)
moles of Al = 0.500 mol
2 Al (s) + 3 Cl₂ (g) ----> 2 AlCl₃
Now, according to the coefficients of the reaction, 2 moles of Al will react with 3 moles of Cl₂. So the molar ratio between them is 2 to 3. We can use that relationship to find the number of Cl₂ that will react with 0.500 mol of Al.
2 mol of Al : 3 moles of Cl₂ molar ratio
moles of Cl₂ = 0.500 mol of Al * 3 moles of Cl₂/(2 moles of Al)
moles of Cl₂ = 0.750 mol
And finally we can convert back to grams using the molar mass of Cl₂.
molar mass of Cl₂ = 70.91 g/mol
mass of Cl₂ = 0.750 moles * 70.91 g/(1 mol)
mass of Cl₂ = 53.2 g
Answer: a. 53.2 g of Cl₂ for complete reaction.
If a gas has a pressure of 6 atm , a temp of 53k and a volume of 78 liters but the temp changes to 17k and the pressure changes to 85 atm what is the new volume
answer and explanation
we are given initial values of temperature, pressure and volume as well as the final value of temperature and pressure and we are asked to find the final volume.
we can do this using the combined gas equation
P1V1/T1 = P2V2/T2
when we plug in the values we get:
(6atm x78L)/53K = (85atm x V2/17K
8.83 = 85atm x V2 / 17K
V2 = 1.77 Liters
The solubility in hexane of organic compound O is measured and found to be 0.520-that would contain 120. mg of O at this temperature.Be sure your answer has the correct unit symbol and 3 significant digits.00.0olo88at 25. °C. Calculate the volume of a saturated solution of O in hexanemLE
According to the explanation given in the previous session, now we have hexane in an organic compound with the solubility of 0.520 g/mL at 25°C. We need to find the value of volume at 120.0 mg
1 gram = 1000 mg
120.0 mg = 0.12 grams
Now we can calculate the volume:
0.520g = 1 mL
0.12g = x mL
0.520x = 0.12
x = 0.12/0.520
x = 0.231 mL is the volume for this compound
What is the correct lewis structure for CO2?a) Ab) Bc) Cd) D
Of the options given, the correct one for the Lewis structure of CO₂ is option A.
In the covalent structure of CO₂, each atom will tend to have 8 electrons on its side, in order to comply with the octet rule. In this rule, an atom that has 8 electrons in its valence shell, will gain stability for having a noble gas electronic configuration.
Hence, the correct lewis structure for CO₂ is option A. In this configuration, each atom has 8 electrons on its side and all of them are neutral (the total charge of the molecule is zero). They all achieve the octet rule.
Although in option B all the atoms have 8 electrons (thus complying with the octet rule), in this configuration the oxygen atom on the left has a negative charge (-1) and the oxygen on the right side has a positive charge (+1). The total charge on the molecule is zero (it is neutral). In fact, this is a resonance structure of configuration A.
In option C, the total charge of the molecule is -2, so this is not a stable configuration. The number of electrons on carbon is wrong.
Finally, in option D the oxygen on the right side does not achieve the octet rule (it only has 6 electrons shared), and also the carbon atom has a charge of -2, and the oxygens have charges of -1 (left) and +3 (right), so this is not a stable configuration.
Therefore, the correct lewis structure for CO₂ is option A.
I do not know how to find out what pairs will make an ionic bond, i am also confused on the difference between a covalent bond and ionic.
In simple terms a covalent bond is when we have sharing of electrons, which means there is no polarity being formed when the elements are bonded, this is more likely to occur with atoms with high electronegativity, or same pair of elements, like O2, where we have O - O (Oxygen bonded with Oxygen), since they have the same electronegativity, there is no charge being formed
The same can not be told for ionic bonds, where we have very different elements being bonded together, with a big electronegativity difference, which means we have polarity being formed (which basically means that we have charge in the compound)
One way to find out if a compound is covalent or ionic is by checking their positions in the periodic table, for example, let's analyze our question
We have:
A) Fluorine - Fluorine, here we have a classical example of covalent bond, since there is no "stronger" element, pulling the electrons towards its side, they are the same, hence, the same strength
B) Carbon - Chlorine, we have two non-metals, with a relatively high electronegativity each one of them, so there is ions being formed, therefore it is covalent
C) Potassium - Oxygen, in this case we have a metal and non-metal bonding together, and since potassium has only 1 electron in its valence shell, it will easily give up this electron to another element, therefore K will receive a positive charge (which means loss of electron) and oxygen will receive a negative charge (which means gain of electron), and this is an ionic bond
D) Oxygen - nitrogen is the same case as letter B
It is also possible to check an electronegativity table, in which there are some rules that helps you understand if a compound is more likely to be covalent or ionic
According to Bronsted-Lowry Theory, a base is.....Group of answer choicesa H+ donora H+ acceptora OH- donorwater
answer and explanation
a bronsted-lowry basic is a H+ donor
What is the [ OH -1 ] in a 0.01 M KOH solution? a. 1 X 10^-2 M b. 1 X 10^-14M c. 1 X 10^-7Md. 1X10^-12M
Answer
Explanation
Given:
[KOH] = 0.01 M
What to find:
The hydroxyl concentration, [OH⁻¹].
Step-by-step solution:
pH or pOH is the measure of acidity or alkalinity of a solution.
Acids have pH ranging from 1 to 6.9 and bases have pH ranging from 7.1 to 14. Neutral substances have a pH of 7.
The dissociation of KOH in aqueous medium is:T
[tex]undefined[/tex]I need help regarding the theoretical yield. Why are we doing 6 / 3 in the second step? (20 POINTS)
In calculating the theoretical yield of ammonia, the 6/3 done in the second step is to convert moles of hydrogen to moles of ammonia since the mole ratio of hydrogen to ammonia is 3 : 2.
What is the theoretical yield of a reaction?The theoretical yield of a reaction is the maximum amount of product that can be obtained from a given reaction based on the equation of the reaction.
The theoretical yield of a reaction is obtained from the mole ratio of the limiting reagent and the product of the reaction.
Considering the given reaction whose reaction equation is given below:
N₂ (g) + 3 H₂ (g) ---> 2 NH₃ (g)
Hydrogen is given as the limiting reagent:
The amount of hydrogen present 12 g
Moles of hydrogen = 12 g/ 2 g/mol = 6 moles
Mole ratio of ammonia to hydrogen = 3 : 2
Moles of ammonia produced = moles of hydrogen * mole ratio of ammoia to hydrogen
Moles of ammonia = 6 moles * 2/3 moles = 4 moles
Mass of ammonia produced = 4 moles * 17 g/mol
Mass of ammonia produced = 68 g
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calculating formal charge
The carbonate ion has the simplest oxo carbon anion structure. One carbon atom is surrounded by three oxygen atoms in a trigonal planar arrangement, giving it D3h molecular symmetry. Its molecular mass is 60.01 g/ mol and its formal charge overall is HCO3.
Explain about the structure of carbonate ion?
Carbonate Organization its structure is a trigonal planar arrangement of three oxygen atoms surrounding a carbon atom. Two single bonds to the negative oxygen atom and two double bonds to the neutral oxygen atom make up the carbonate ion's Lewis structure.
The carbonate ion, a salt of carbonic acid, is the most basic form of the oxo carbon anion. A polyatomic ion, it has the chemical formula CO32-. The term "carbonate" can also refer to a carbonate ester, an organic molecule with the carbonate group C(=O)(O-)2.
The carbonate has a valency of two because it may combine with two hydrogen atoms.
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The reaction represented by the following equation is a reversible process. N2O4(g)➡️⬅️2NO2(g)If you were to allow 1 mol of NO2 to react in a sealed container for some time, what would you expect to find in the container?NO2 onlyN2O4 onlyNothing, the vessel would be emptySome N2O4 and some NO2
Explanation:
The reaction:
N2O4(g) <=> 2NO2(g)
Inicially 0 [1 mol/Volume]
Reacts +x -2x
Equilibrium +x [1 mol/Volume]-2x
[1 mol/Volume] means molarity
In a chemical reaction, chemical equilibrium is the state in which the forward reaction rate and the reverse reaction rate are equal. The result of this equilibrium is that the concentrations of the reactants and the products do not change.
Therefore, the answer: Some N2O4 and some NO2
What is a quasar?
Two stars moving around each other.
A star that emits a repeated radio signal.
A star that emits intense radio and light energy.
A system of stars held together by gravity.
A collapsed star emitting no light.
A quasar is a star that emits intense radio and light energy.
A quasar is an extremely bright radio source. It is called a quasi-stellar radio source. It appears to be like a star but is not a star. These quasars are young galaxies that are located far away from us and are highly luminous. The luminosity of a quasar is 1000 times greater than the luminosity of a milky way galaxy.
A quasar is powered by a supermassive black hole with its mass ranging from millions to tens of billions of solar masses, surrounded by a gaseous accretion disc.
The quasars were first discovered in the 1950s using the Hubble space telescope and were found to be a massive bright source emitting radio waves of unknown origin. But now, millions of quasars were discovered.
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Define electronegativity.
A neutral atom has high electronegativity. Describe what happens to this atom during ionic bond formation.
No trolls, fake answers, copied answers
a) Electronegativity has to do with the fact that electrons are unequally shared in a bond
b) The electronegative tom would receive electrons in an ionic bond.
What is electronegativity?The term electronegativity has to do with the fact that in some atoms, the electron cloud could be closer to them in a covalent bonding situation than to the other atom. You need to recall that in a covalent bond, the electron pair of the bond is shared and the electron cloud is expected to be equidistant between the nuclei of the two atoms that are bonding.
In a case where the electron cloud seems to be closer to one atom than the other then the other atom is said to be highly electronegative. We also need to knw that in an ionic bond, there is a transfer of electrons from one atom to the other.
If one of the bonding atoms in an ionic bond is highly electronegative, it then follows that electrons would be transferred to that atom in the process of ionic bonding.
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Will the artificial cell become more flaccid, more turgid, or stay the same?
Options:
A) The artificial cell will burst.
B) The artificial cell will stay the same.
C) The artificial cell will become more flaccid.
D) The artificial cell will become more turgid.
The correct answerwer is option D.
D)The artificial cell will become more turgid.
What is a cell?
The cell is the basic building block of all living things. The human body contains many cells and they provide structure for the body. They take in nutrients from the food and convert them to energy for the body. they also carry out specialized functions.
Artificial cells are engineered particles that look like natural biological cells. example proteins, genes, enzymes, etc
Flaccid cells are shrunken cells while turgid cells are stretched due to the absorption of water.
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which atoms has the greatest nuclear charge 7 14N, 6 12C,1 2H or 1 2He
Based on the atomic number of the given elements, the atoms that have the greatest nuclear charge is ¹⁴₇N; option A.
What is the nuclear charge in atoms?The nuclear charge in atoms is the charge in the nucleus due to the presence of the positively-charged protons present in the nucleus of an atom.
The nuclear charge of atoms increases with an increase in the atomic number of the elements.
Hence, for elements in the period table, the size of the nuclear charge increases both down the group and across a period from left to right.
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Where did you observe thermal energy in the circuit?
Thermal energy in a circuit comes from the electrical energy that is transformed into heat. It is observed in resistors, capacitances and inductances.
The electrical energy in a circuit is converted into heat by the thermal energy. It relies on the sort of circuit under evaluation, which in turn depends on the circuit's components. These elements include resistors, capacitances, and inductances—individually or in combination.
The sum of the squares of the current, resistance, and power dissipated. The impedance of the circuit must be computed for an LCR circuit. then utilizing the impedance, the circuit's current may be estimated.
P=V^2/R
Hence, the thermal energy in a circuit is observed in resistors, capacitances and inductances.
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If the mercury in a barometer raises 22.8 centimeters due to a change in ambient pressure, what is the corresponding change in pressure in atm?
If the mercury in a barometer raises 22.8 centimeters due to a change in ambient pressure, then the corresponding change in pressure would be 0.3 atm.
What is pressure?The total applied force per unit of area is known as the pressure.
The pressure depends both on externally applied force as well the area on which it is applied
As given in the problem If the mercury in a barometer raises 22.8 centimeters due to a change in ambient pressure, then we have to find out the corresponding change in pressure in atm,
760 mm of Hg = 1 atm
76 cm of Hg = 1 atm
1 cm of Hg = 1 / 76 atm
22.8 cm of Hg = 22.8 / 76 atm
= 0.3 atm
Thus , the corresponding change in pressure in atm would be 0.3 atm .
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True or false; CH40 is an electrolyte?
Explanation:
An electrolyte has to be capable of of ionizing and CH40 is not.
Therefore, CH40 is not an electrolyte.
Answer:
False
3. A 5.00 mole sample of oxygen gas has a pressure of 1.25 atm at 22℃. What is the volume of the gas?
The volume of a gas that has a pressure of 1.25 atm at 22℃ is 96.88L.
How to calculate volume?The volume of a gas can be calculated by using the following formula:
PV = nRT
Where;
P = pressure of the gas V = volume of the gasn = number of moles of the gasT = temperatureR = gas law constantAccording to this question, 5.00 mole sample of oxygen gas has a pressure of 1.25 atm at 22℃. The volume can be calculated as follows:
1.25 × V = 5 × 0.0821 × 295
1.25V = 121.0975
V = 96.88L
Therefore, 96.88L is the volume of the gas
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Notice that " PO4 " appears in two different places in this chemical equation. PO 3−4 is a polyatomic ion called phosphate . What number should be placed in front of Na3PO4 to give the same total number of phosphate ions on each side of the equation?
?Na3PO4+MgCl2→Mg3(PO4)2+NaCl
Express your answer numerically as an integer.
PO₄ appears in two different places in this chemical equation. PO₃⁻⁴ is a polyatomic ion called phosphate. 2 should be placed in front of Na₃PO₄ to give the same total number of phosphate ions on each side of the equation.
For the reaction -
? Na₃PO₄ + MgCl₂ → Mg₃(PO₄)₂ + NaCl
There are 2 phosphate ions present on the product side, therefore, 2 phosphate atoms should be present on the reactant side to maintain the equilibrium.
On product side, number of ions of magnesium is 3, so to attain the equilibrium and balance the equation there 3 ions of magnesium should be on the reactant side.
In order to balance the number of ions of phosphate and magnesium in the reaction which is given -
On the reactant side, 6 atoms of chlorine and sodium are formed, in order to balance these 6 atoms of chlorine and sodium, 6 atoms of each should be present on the product side.
Therefore, the balanced chemical equation is -
2 Na₃PO₄ + 3 MgCl₂ → Mg₃(PO₄)₂ + 6 NaCl
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how do you determine what the product of a chemical reaction would be
Answer and explanation
To predict the product, you need to first have or know your reactans, for example, if you have magnesium (Mg) + oxygen (O2), the product should include both reactants. Oxidation numbers also play a role of the final charge of the product, magnesium has a charge of 2+ and O has a charge of 2-, therefore the product will be MgO
Example 2
Na2CO3 + HCl
When sodium carbonate (Na2CO3) reacts with HCl, Na+, O^-2 and CO2 dissociates in the solution, H+ and Cl- also dissociates, what happens is that the oppositely charges ions attract and form compounds, Na is positive and Cl is negative, they will combine to form NaCl, the hydrogen has a positive charge (+1), it will combine with excess oxygen (O^-2) forming water (H2O) and the CO2 will not combine with anything since it is not an ion
Final equation:
Na2CO3 + HCl = NaCl + H2O + CO2
Now we can balance the equation:
Na2CO3 + 2HCl = 2NaCl + H2O + CO2
Which of the following statements is one of the postulates in Dalton’s atomic theory?1. Atoms of different elements can physically mix together.2. Atoms of one element can be changed into atoms of another element through a chemical reaction.3. All compounds are composed of multiple elements combined together.4. Atoms of one element cannot be changed into another element through a chemical reaction.
Answer:
All atoms of a specific element are identical in mass, size, and other properties. However, atoms of different element exhibit different properties and vary in mass and size. Atoms can neither be created nor destroyed. Furthermore, atoms cannot be divided into smaller particles.
D
A student mixes a tablespoon of powdered lemonade into 8 ounces of
water. She weighs the powdered lemonade and the water separately.
After mixing, the student finds the weight of the combined mixture.
Which of the following will the student most likely observe about the
weight of the mixture?
A. The weight of the mixture will be less than the combined weight
of the powdered lemonade and the water.
B. The weight of the mixture will be the same as the combined
weight of the powdered lemonade and the water.
. C.The weight of the mixture will be more than the combined
weight of the powdered lemonade and the water.
. D. The weight of the mixture will be the average of the weight of
the powdered lemonade and the weight of the water.
●
●
The weight of the mixture will be the same as the combined
weight of the powdered lemonade and the water.
What is a mixture?The term mixture has to do with the combination of two or more substances that are not chemically combined together. We can see that due to the fact that substances that can be found in a mixture are not chemically combined together, then they can be separated by the means of physical methods.
We have to also bear in mind that mass can not be created nor destroyed but can be converted from one form to another. This implies that the total mass of the mixture must be the same as the sum of the masses of the individual components that are found in the mixture as this is in obedience to the law of the conservation of mass that have been detailed above in this answer.
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A chemist prepares a solution of magnesium fluoride (MgF2) by measuring out 6.73mg of magnesium fluoride into a 250.mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's magnesium fluoride solution. Round your answer to 3 significant digits.
We have to find the molarity of a solution of Magnesium Fluoride. The definition of molarity is:
Molarity = moles of solute/Volume of solution in L
Our solute is MgF₂:
Molarity = moles of MgF₂ / L of solution
From the problem we know that the volume of the solution that the chemist prepared is 250. mL, we will have to convert that into L.
We know that there are 1000 mL in 1 L. So:
1 L = 1000 mL
250. mL = 250. mL * 1 L/1000 mL = 0.250 L
Volume of solution in L = 0.250 L
Now we have to find the number of moles of MgF₂ that the chemist added. From the problem we know the mass of MgF₂ added. Let's convert it to g:
1000 mg = 1 g
mass of MgF₂ = 6-73 mg
6.73 mg = 6.73 mg * 1 g/1000 mg = 0.00673 g
mass of MgF₂ = 0.00673 g
When we want to find the number of moles that we ave in a certain amount of a compound, we have to use the molar mass. Let's find the molar mass of MgF₂.
According to the periodic table the atomic mass of Mg is 24.3 amu and the atomic mass of F is 19 amu. So the molar mass of MgF₂ is:
molar mass of MgF₂ = 24.3 + 2 * 19 = 62.3 g/mol
molar mass of MgF₂ = 62.3 g/mol
Using the molar mass we can find the number of moles that we have in 6.73 mg or 0.00673 g of MgF₂:
moles of MgF₂ = 0.00673 g/(62.3 g/mol)
moles of MgF₂ = 1.08 * 10^-4 moles
So the chemist added 1.08 * 10^-4 moles of MgF₂ in 0.250 L of solution. Then the molarity of the solution is:
Molarity = moles of solute/Volume of solution in L
Molarity = 1.08 * 10^-4 moles/0.250 L
Molarity = 4.32 * 10^-4 M
So the answer to our problem is 4.32 * 10^-4 M