The reaction which shows heat of formation of water correctly is

Options

A. `H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(l)`, `DeltaH= -68.3 kcal`
B. `H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(s)`, `DeltaH= -68.3 kcal`
C. `H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(g)`, `DeltaH= -68.3 kcal`
D. `2H_(2)(g)+O_(2)(g)to2H_(2)O(l)`, `DeltaH= -136.6 kcal`

Answer

A

Explanation

See definition of heat of formation.