The standard entropy change `Delta S_r^@` for
`CH_(4(g)) + 2O_(2(g)) to CO_(2(g)) + 2H_2O_((l))`
is -242.98 `JK^(-1)` at `25^@C`. Calculate the standard reaction enthalpy for the above reaction if standard Gibbs energy of formation of `CH_(4(g)), CO_(2(g)) and H_2O_((l))` are -50.72, -394.36 and - 237.13 kJ `mol^(-1)` respectively.

Explanation

`Delta H_r^@ = - 890.31 kJ.mol^(-1)`