calculate delta H rxn for this reaction using 

delta Hf [NaNO3(s)]: -467.8 kJ/mol

delta Hf [NaHSO4(s)]: -1125.5

delta Hf [H2SO4(l)]: -814.0

delta Hf [HNO3(g)]: -135.1

NaNO3(s) + H2SO4(l) -> NaHSO4(s) + HNO3(g)

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