In which of the following reactions does the heat change represent the heat of formation of water [EAMCET 1991]

(1) 2H2(g)+O2(g)2H2O(l);ΔH=116kcal

(2) H2(g)+12O2(g)H2O(l);ΔH=58kcal

(3) H+(aq.)+OH(aq.)2H2O(l);ΔH=13.7kcal

(4) C2H2(g)+212O2(g)2CO2(g)+H2O(l); ΔH=310kcal

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