Ask Question
1 March, 09:04

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)

+1
Answers (1)
  1. 1 March, 09:27
    0
    21.2 kJ/mol

    Explanation:

    Let's consider the following reaction for the synthesis of nitric acid.

    NaNO₃ (s) + H₂SO₄ (l) → NaHSO₄ (s) + HNO₃ (g)

    We can calculate the standard enthalpy of the reaction (ΔH°rxn) using the following expression.

    ΔH°rxn = ∑ np * ΔH°f (p) - ∑ nr * ΔH°f (r)

    where,

    n: moles

    ΔH°f: standard enthalpy of formation

    p: products

    r: reactants

    ΔH°rxn = 1 mol * ΔH°f (NaHSO₄) + 1 mol * ΔH°f (HNO₃) - 1 mol * ΔH°f (NaNO₃) - 1 mol * ΔH°f (H₂SO₄)

    ΔH°rxn = 1 mol * (-1125.5 kJ/mol) + 1 mol * (-135.1 kJ/mol) - 1 mol * (-467.8 kJ/mol) - 1 mol * (-814.0 kJ/mol)

    ΔH°rxn = 21.2 kJ/mol
Know the Answer?
Not Sure About the Answer?
Find an answer to your question 👍 “Nitric acid, which is among the top 15 chemicals produced in the United States, was first prepared over 1200 years ago by heating naturally ...” in 📗 Chemistry if the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers