#121 Given the data in the table below, ΔH°rxn for the reaction

Given the data in the table below, ΔH°rxn for the reaction - Physical Chemistry Chemistry

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Free Chegg Question

Given the data in the table below, ΔH°rxn for the reaction Ca(OH)2 + 2H3AsO4 → Ca(H2AsO4)2 + 2H2O
is ________ kJ.
Ca(OH)2 -986.6  ΔH°f (KJ/mol)
H3As O4 -900.4ΔH°f (KJ/mol)
Ca(H2AsO4)2 -2346.0ΔH°f (KJ/mol)
H2O -285.9ΔH°f (KJ/mol)
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Free Chegg Answer

delta H^orxn = sum of delta H^of (products) - sum of delta H^of (reactants)
    = [-2346 + 2 x -(285.9)] - [-986.6 + (2 x -900.4)]
    = -2917.8 + 2787.4
    = -130.4 kJ