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tester [92]
3 years ago
10

Example: One liter of saturated calcium fluoride

Chemistry
1 answer:
krek1111 [17]3 years ago
7 0

Answer:

Molar\ solubility=2.14x10^{-4}M

Ksp=3.91x10^{-11}

Explanation:

Hello,

In this case, given that 0.0167 grams of calcium fluoride in 1 L of solution form a saturated one, we can notice it is the solubility, therefore, the molar solubility is computed by using the molar mass of calcium fluoride (78.1 g/mol):

Molar\ solubility=\frac{0.0167gCaF_2}{1L}*\frac{1molCaF_2}{78.1gCaF_2}  \\\\Molar\ solubility=2.14x10^{-4}M

Next, since dissociation equation for calcium fluoride is:

CaF_2(s)\rightarrow Ca^{2+}(aq)+2F^-(aq)

The equilibrium expression is:

Ksp=[Ca^{2+}][F^-]^2

We can compute the solubility product by remembering that the concentration of both calcium and fluoride ions equals the molar solubility, thereby:

Ksp=(2.14x10^{-4})(2*2.14x10^{-4})^2\\\\Ksp=3.91x10^{-11}

Regards.

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The formula for mole fraction is:

mole fraction of solute = \frac{number of moles of solute}{total number of moles of solution}    -(1)

The solubility of oxygen gas = 1.0 mmol/L  (given)

1.0 mmol/L means 1.0 mmol are present in 1 L.

Converting mmol to mol:

1.00 mmol\times \frac{1 mol}{1000 mmol} = 0.001 mol

So, moles of oxygen = 0.001 mol

For moles of water:

1 L of water = 1000 mL of water

Since, the density of water is 1.0 g/mL.

Density = \frac{mass}{volume}

Mass = 1.0 g/ml\times 1000 mL = 1000 g

So, the mass of water is 1000 g.

Molar mass of water = 18 g/mol.

Number of moles of water = \frac{1000 g}{18 g/mol} = 55.55 mol

Substituting the values in formula (1):

mole fraction = \frac{0.001}{55.55+0.001}

mole fraction = 1.8\times 10^{-5}

Hence, the mole fraction is 1.8\times 10^{-5}.

7 0
3 years ago
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Answer:

C. The potential energy change for a chemical reaction.

Explanation:

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iragen [17]

Answer:

The answer is "Option B"

Explanation:

From the query, the following knowledge is derived:  

Yield in percentage = 47%  

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Rate = \frac{Existing \ Rate} {Theoretical \ Rate} \times 100

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