A solution contains 58.5 g sodium chloride and 180 g water. What is the approximate mole fraction of sodium chloride?
Answer and explanation
Correct answer: 0.091
The governing concept is mole fraction, defined as moles of one component divided by total moles of all components. Sodium chloride contributes 58.5/58.5 = 1 mol, while water contributes 180/18 = 10 mol. Thus total moles are 11 and x(NaCl) = 1/11 = 0.0909, approximately 0.091. Option A is too low, option C rounds incorrectly, and option D ignores the water contribution.
Frequently asked questions
What is the correct answer to this question?
0.091
Why is this the correct answer?
The governing concept is mole fraction, defined as moles of one component divided by total moles of all components. Sodium chloride contributes 58.5/58.5 = 1 mol, while water contributes 180/18 = 10 mol. Thus total moles are 11 and x(NaCl) = 1/11 = 0.0909, approximately 0.091. Option A is too low, option C rounds incorrectly, and option D ignores the water contribution.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
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