alleryStart learning →What does the molar mass of a substance measure, and in what unit?
AThe mass of one molecule of it, in atomic mass units
BThe number of atoms in one gram of it, in atoms per gram
CThe volume filled by one mole of it, in litres per mole
DThe mass of one mole of it, in grams per mole
Answer & Solution
Correct answer: D. The mass of one mole of it, in grams per mole
1. Molar mass is the mass in grams of exactly one mole of a substance.
2. Being a mass divided by an amount, it carries the unit grams per mole.
3. The mass of a single molecule is the molecular mass in amu, a different quantity on a vastly smaller scale.
4. Molar volume in litres per mole is not what molar mass measures.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 3 "Composition of Substances and Solutions", section 3.1 Formula Mass and the Mole Concept_
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