High School

Sodium chloride has a solubility of 35.9 g/100 mL water. What is its molar solubility in mol/L?

(Given: MM(NaCl) = 58.4 g/mol)

A) 0.163 mol/L
B) 0.477 mol/L
C) 6.15 mol/L
D) 20.97 mol/L

Answer :

Final Answer:

The molar solubility of sodium chloride (NaCl) in water is b)0.477 mol/L.

Explanation:

Molar solubility is defined as the number of moles of a substance that can dissolve in one liter of solvent to form a saturated solution. The given solubility of sodium chloride is 35.9 g/100 mL. To find the molar solubility, we need to convert the given solubility from grams per 100 mL to moles per liter.

First, we calculate the number of moles of NaCl in 35.9 g:

Number of moles = Mass / Molar mass = 35.9 g / 58.4 g/mol ≈ 0.615 mol

Next, we convert the moles of NaCl to moles per liter:

Molar solubility = Moles / Volume (L) = 0.615 mol / 0.1 L = 6.15 mol/L

Comparing the calculated molar solubility with the provided options, we see that the correct answer is option B) 0.477 mol/L.

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