Calculate the molar mass of sulfuric acid (H2SO4). (Atomic masses: H = 1.0, S = 32.1, O = 16.0 g/mol)
Answer and explanation
Correct answer: D. 98.1 g/mol
- Step 1: Sum the atomic masses of all constituent atoms in the chemical formula:
- Step 2: 2(1.0) + 1(32.1) + 4*(16.0) = 2.0 + 32.1 + 64.0 = 98.1 g/mol.
Answer
98.1 g/mol.
Why not the others: '82.1 g/mol' forgets one oxygen atom; '104.1 g/mol' uses incorrect atomic weights; '49.1 g/mol' divides molar mass by 2 (the equivalent weight).
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