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What is the mass of 0.443 mol of hydrazine, N2H4? Use N = 14.007 and H = 1.008 g/mol.
A14.2 g
B12.4 g
C1.42 g
D0.0138 g
Answer & Solution
Correct answer: A. 14.2 g
1. Build the molar mass first: nitrogen contributes 2 x 14.007 = 28.014 g/mol.
2. Hydrogen contributes 4 x 1.008 = 4.032 g/mol, so the molar mass is 32.05 g/mol.
3. Mass equals moles times molar mass: 0.443 mol x 32.05 g/mol = 14.2 g.
4. The value 12.4 g uses only the nitrogen part of the molar mass, dropping the four hydrogen atoms.
5. The value 0.0138 g divides the moles by the molar mass instead of multiplying.
_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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