If 0.2 mol of a solute has a mass of 12 g, what is its molar mass?
Answer and explanation
Correct answer: 60 g mol⁻¹
Molar mass is the mass of one mole of a substance and is calculated using M = m/n, where m is the given mass and n is the amount in moles. Substituting the data gives M = 12 g ÷ 0.2 mol = 60 g mol⁻¹. Therefore, option C is correct. The answer 120 g mol⁻¹ would result from incorrectly treating the amount as 0.1 mol.
Frequently asked questions
What is the correct answer to this question?
60 g mol⁻¹
Why is this the correct answer?
Molar mass is the mass of one mole of a substance and is calculated using M = m/n, where m is the given mass and n is the amount in moles. Substituting the data gives M = 12 g ÷ 0.2 mol = 60 g mol⁻¹. Therefore, option C is correct. The answer 120 g mol⁻¹ would result from incorrectly treating the amount as 0.1 mol.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Some Basic Concepts of Chemistry. Topic: Mole concept and molar mass.
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