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

(1) $2{H}_{2}\left(g\right)+{O}_{2}\left(g\right)\to 2{H}_{2}O\left(l\right);\text{\hspace{0.17em}}\Delta H=-116\text{\hspace{0.17em}}kcal$

(2) ${H}_{2}\left(g\right)+\frac{1}{2}{O}_{2}\left(g\right)\to {H}_{2}O\left(l\right);\text{\hspace{0.17em}}\Delta H=-58\text{\hspace{0.17em}}kcal$

(3) ${H}^{+}\left(aq.\right)+O{H}^{-}\left(aq.\right)\to 2{H}_{2}O\left(l\right);\text{\hspace{0.17em}}\Delta H=-13.7\text{\hspace{0.17em}}kcal$

(4) ${C}_{2}{H}_{2}\left(g\right)+2\frac{1}{2}{O}_{2}\left(g\right)\to 2C{O}_{2}\left(g\right)+{H}_{2}O\left(l\right)$; $\Delta H=-310\text{\hspace{0.17em}}kcal$

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