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13 October, 17:51

P4O10 (s) = - 3110 kJ/mol H2O (l) = - 286 kJ/mol H3PO4 (s) = - 1279 kJ/mol Calculate the change in enthalpy for the following process: P4O10 (s) + 6H2O (l) → 4H3PO4 (s)

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  1. 13 October, 21:38
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    -290KJ/mol

    Explanation:

    ΔHrxn = ΔHproduct - ΔHreactant

    ΔHrxn = 4ΔHH3PO4 - {6ΔHH2O + ΔHP4O10}

    ΔHrxn = 4 (-1279) - [6 (-286) - 3110]

    = - 5116 - (-1716-3110)

    = - 5116 - (-4826)

    = - 5116 + 4826 = - 290KJ/mol
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