What is the mass percent of an aqueous sodium hydroxide solution in which the mole fraction of NaOH is 0.0736?
A) 15.0%
B) 16%
C) 69%
D) 9%
E) 3%

Question

Quizplus · Accepted Answer

The mole fraction of NaOH is 0.0736, so the mole fraction of water is 1 - 0.0736 = 0.9264. The molar mass of NaOH is 40.00 g/mol, and the molar mass of water is 18.02 g/mol. So, the mass percent of NaOH is:(0.0736 mol NaOH * 40.00 g/mol NaOH) / (0.0736 mol NaOH * 40.00 g/mol NaOH + 0.9264 mol H2O * 18.02 g/mol H2O) * 100% = 15.0%

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