A compound has a formula mass of 58.44 amu. What is its molar mass?
A58.44 g/mol
B5.844 g/mol
C584.4 g/mol
D29.22 g/mol
Answer & Solution
Correct answer: A. 58.44 g/mol
1. The atomic mass unit and the mole are both defined against the same reference substance, carbon-12.
2. Because of that shared reference, the molar mass in g/mol is numerically equal to the formula mass in amu.
3. A formula mass of 58.44 amu therefore gives a molar mass of 58.44 g/mol.
4. No factor of ten or division by two enters anywhere, so the other three values cannot arise.
_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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