What is the mole fraction of sodium chloride in solution that is 13.0% by mass sodium chloride and that has a density of 1.10 g/mL?
A)0.0442
B)0.0462
C)0.223
D)0.483
E)0.505

Question

Quizplus · Accepted Answer

The correct answer is A because the mole fraction of sodium chloride in solution can be calculated using the formula:X_NaCl = (mass of NaCl / molar mass of NaCl) / (mass of solution / molar mass of solution)where the mass of NaCl is 13.0 g, the molar mass of NaCl is 58.44 g/mol, the mass of solution is 100 g, and the molar mass of solution is 18.02 g/mol. Plugging these values into the formula, we get:X_NaCl = (13.0 g / 58.44 g/mol) / (100 g / 18.02 g/mol) = 0.0442

What Is the Mole Fraction of Sodium Chloride in Solution