The standared enthalpies of formation at `298K` for `C C1(g), H_(2)O(g), CO_(2)(g)` and `HC1(g)` are `-106.7, -241.8, -393.7`, and `-92.5kJ mol^(-1)`, respectively. Calculate `DeltaH^(Theta)underset(298K)` for the reaction
`C C1_(4)(g) +2H_(2)O(g) rarr CO_(2)(g) +4HCI_(g)`

Explanation

The enthalpy change of the given reaction will be given as
`DeltaH^(Theta) (CO_(2),g) +4Delta_(f)H^(Theta) (HCI,g)`
`- Delta_(f)H^(Theta) (C CI_(4),g) -2Delta_(f)H^(Theta) (H_(2)O, g)`
` =(-393.7-4 xx 92.5 + 106.7+2 xx 241.8) kJ mol^(-1)`
`=- 173.4 kJ mol^(-1)`