If the mole fraction of solute is 0.1 and the total number of moles is 2, how many moles of solute are present?
Answer and explanation
Correct answer: 0.2 mol
Mole fraction is defined as xsolute = nsolute/ntotal. Rearranging gives nsolute = xsolute × ntotal. Therefore, nsolute = 0.1 × 2 = 0.2 mol. The value 1.8 mol would be the number of moles of the other component if there were only solute and solvent, because the solvent mole fraction would be 1 − 0.1 = 0.9 and its moles would be 1.8 mol.
Frequently asked questions
What is the correct answer to this question?
0.2 mol
Why is this the correct answer?
Mole fraction is defined as xsolute = nsolute/ntotal. Rearranging gives nsolute = xsolute × ntotal. Therefore, nsolute = 0.1 × 2 = 0.2 mol. The value 1.8 mol would be the number of moles of the other component if there were only solute and solvent, because the solvent mole fraction would be 1 − 0.1 = 0.9 and its moles would be 1.8 mol.
Which subject and chapter does this question cover?
This is a Class 12 Chemistry question. Chapter: Chapter 01: Solutions. Topic: 6: Molar Mass Determination.
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