Which of the following equations corresponds to the definition of standard enthalpy of formation of methanol at 298 K?

Options

A. `C _(("graphite")) + 2 H _(2 (g) ) + 1/2 O _(2 (l))to CH _(3) OH _((g))`
B. `C _(("diamond")) + 2 H _(2 (g) ) + 1/2 O _(2 (l))to CH _(3) OH _((g))`
C. `2C _(("graphite")) + 4 H _(2 (g) ) + O _(2 (g))to 2CH _(3) OH _((l))`
D. `C _(("graphite")) + 2 H _(2 (g)) + 1/2 O _(2 (g)) to CH _(3) OH_((l))`

Answer

D

Explanation

In standard enthalpy of formation, rectants and products must be in standard state.