The standard enthalpy of formation (ΔH˚f) refers to the enthalpy change for the formation of 1 mole of a compound from its elements in their standard states.
If the heat of formation of H2O(l) is -286 kJ/mol, which of the following thermochemical equations for the formation of H2O is correct?
a) H2 (g) + 1 /2 O2 (g) → H2O(l) ΔH = − 286 kJ
b) 2 H(g) + O(g) → H2O(l) ΔH = − 286 kJ
c) H2 (g) + O(g) → H2O(g) ΔH = − 286 kJ
d) H2O(l) → H2 (g) + 1/2 O2 (g) ΔH = 286 kJ
e) 2 H2 (g) + O2 (g) → 2 H2O(l) ΔH = − 286 kJ
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