Which of the following equations correctly represents the standard heat of formation`(Delta H_f^@)` of methane?

Options

A. C(diamond) + `2H_(2)(g)to CH_(4) (g)`
B. C(graphite) + `2H_(2)(g) to CH_(4) (I)`
C. C(graphite) + `2H_(2)(g) to CH_(4) (g)`
D. C(graphite) + `4H to CH_(4) (g)`

Answer

C

Explanation

At `25^@C`, the state of methane is gas and the elementary form of carbon is graphite.