Nitric Acid, Which Is Among the Top 15 Chemicals Produced

question 67

Multiple Choice

Nitric acid, which is among the top 15 chemicals produced in the United States, was first prepared over 1200 years ago by heating naturally occurring sodium nitrate (called saltpeter) with sulfuric acid and collecting the vapors produced. Calculate ΔH°_rxn for this reaction. ΔH°_f [NaNO₃(s) ] = −467.8 kJ/mol; ΔH°_f [NaHSO₄(s) ] = −1125.5 kJ/mol; ΔH°_f [H₂SO₄(l) = −814.0 kJ/mol; ΔH°_f [HNO₃(g) ] = −135.1 kJ/mol
NaNO₃(s) + H₂SO₄(l) → NaHSO₄(s) + HNO₃(g)

• A)−644.2 kJ
• B)−291.4 kJ
• C)−21.2 kJ
• D)21.2 kJ
• E)644.2 kJ

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