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7 June, 05:42

Calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest kj.

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  1. 7 June, 06:37
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    The formation of nitric acid from nitrogen, hydrogen, and oxygen can be written as,

    N₂ + H₂ + 3O₂ - - > 2HNO₃

    The net enthalpy of formation of nitric acid is calculated by,

    Hrxn = Hproduct - Hreactant

    Since all the reactants are in their elemental forms, the simplified equation would be,

    Hrxn = Hproduct

    Substituting,

    Hrxn = (-186.81 kJ/mol) (2 mols)

    Answer: - 372.42 kJ
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