1)
"P_4O_{10}(s) + 6H_2O (l) \\rightarrow 4H_3PO_4(aq)"
"\\Delta H_{rxn} = \\sum \\Delta H^0_f(products) - \\sum \\Delta H^0_f(reactants)"
"\\Delta H^0_f(P_4O_{10}(s)) = -2984.0 \\frac{kJ}{mol}"
"\\Delta H^0_f (H_3PO_4(aq)) = -1266.9 \\frac{kJ}{mol}"
"\\Delta H^0_f(H_2O(l)) = -283.8 \\frac{kJ}{mol}"
2)
"H_2CO(g) +O_2(g)\\rightarrow CO_2(g) + H_2O(l)"
"\\Delta H^0_f(H_2O(l)) = -285.8 \\frac{kJ}{mol}"
"\\Delta H^0_f(H_2CO(g)) = -116 \\frac{kJ}{mol}"
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