3 g of a solute is 0.03 mol. What is its molar mass?
Answer and explanation
Correct answer: 100 g mol⁻¹
Use the definition of molar mass: M = mass/amount in moles. The given mass is 3 g and the amount is 0.03 mol. Thus, M = 3/0.03 = 100 g mol⁻¹. Therefore, option D is correct. A useful check is that 0.03 × 100 = 3, which reproduces the stated mass. The answer must have the unit grams per mole, not grams alone or moles per gram.
Frequently asked questions
What is the correct answer to this question?
100 g mol⁻¹
Why is this the correct answer?
Use the definition of molar mass: M = mass/amount in moles. The given mass is 3 g and the amount is 0.03 mol. Thus, M = 3/0.03 = 100 g mol⁻¹. Therefore, option D is correct. A useful check is that 0.03 × 100 = 3, which reproduces the stated mass. The answer must have the unit grams per mole, not grams alone or moles per gram.
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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