What is the mass percent of an aqueous sodium hydroxide solution in which the mole fraction of NaOH is 0.101?

Name: What is the mass percent of an aqueous sodium hydroxide solution in which the mole fraction of NaOH is 0.101?
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Question

Quizplus · Accepted Answer

The mole fraction of NaOH is 0.101, so the mole fraction of water is 0.899. The molar mass of NaOH is 40.00 g/mol, and the molar mass of water is 18.02 g/mol. Therefore, the mass percent of NaOH is:(0.101 * 40.00 g/mol) / (0.101 * 40.00 g/mol + 0.899 * 18.02 g/mol) * 100% = 20.0%

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