Standard heat of formation of `CH_(4)(g), CO_(2)(g)` and `H_(2)O(l)` are -75, -393.5, -286 kJ respectively. Find out the change in enthalpy for the reaction. `CH_(4)(g)+2O_(2)(g)rarr CO_(2)(g)+2H_(2)O(l)`

Explanation

`CH_(4)(g)+2O_(2)(g)rarr CO_(2)(g)+2H_(2)O(l)`
`Delta H_("of reaction")=[Sigma Delta H_(f)^(@)" of product" - Sigma Delta H_(f)^(@)" of reactant"]`
`Delta H^(@)[(-393.5)+2(-286)]-[(-75)+2(0)]`
`Delta H^(@)=(-965.5)-(-75)=-890.5 kJ`