If 18 g of glucose has a molar mass of 180 g mol⁻¹, how many moles of glucose are present?
Answer and explanation
Correct answer: 0.1 mol
The number of moles is obtained by dividing the given mass by the molar mass: n = m/M. Substituting the values gives n = 18 g ÷ (180 g mol⁻¹) = 0.1 mol. The gram units cancel, leaving the unit mol. Therefore, 18 g of glucose represents one-tenth of a mole, and option A is correct.
Frequently asked questions
What is the correct answer to this question?
0.1 mol
Why is this the correct answer?
The number of moles is obtained by dividing the given mass by the molar mass: n = m/M. Substituting the values gives n = 18 g ÷ (180 g mol⁻¹) = 0.1 mol. The gram units cancel, leaving the unit mol. Therefore, 18 g of glucose represents one-tenth of a mole, and option A is correct.
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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