O-LevelChemistryStoichiometry5070/11 · May/June 2012 · Q351 Mark

For which molecules are the empirical and molecular formulae the same? 1. methanoic acid, HCO2H 2. ethanoic acid, CH3CO2H 3. propanoic acid, C2H5CO2H 4. butanoic acid, C3H7CO2H

A1, 2 and 3 only

B1 and 3 only

C2 and 3 only

D2, 3 and 4 only

✓ Correct answer

B: 1 and 3 only

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Topic: Stoichiometry, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2012 Paper 1 Variant 1, question 35.

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