Problem: A scientist measures the standard enthalpy change for the following reaction to be -665.2 kJ: P4O10 (s) + 6H2O (l) → 4H3PO4 (aq) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of H3PO4 (aq) is _________________.

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A scientist measures the standard enthalpy change for the following reaction to be -665.2 kJ: 

P4O10 (s) + 6H2O (l) → 4H3PO4 (aq) 

Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of H3PO4 (aq) is _________________.