A-LevelChemistryAtoms, molecules and stoichiometry9701/12 · Oct/Nov 2011 · Q21 Mark
The following equations the letters W, X, Y and Z all represent whole numbers. When correctly balanced, which equation requires one of letters W, X, Y or Z to be 5?
AWC3H7COOH + XO2 → YCO2 + ZH2O
BWC4H8 + XO2 → YCO2 + ZH2O
CWH3PO4 + XNaOH → YNa2HPO4 + ZH2O
DWNH3 + XO2 → YN2 + ZH2O
✓ Correct answer
A: WC3H7COOH + XO2 → YCO2 + ZH2O
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