Which of the following equation represents standard heat of formation

1.	Which of the following equation represents standard heat of formation of ethanol?
Answer» `CH_(3)CHO_((l)) + (1)/(2)H_(2(g)) OVERSET(Ni)rarr C_(2)H_(5)OH_((l))` `2C_("graphite") + 3H_(2(g)) + (1)/(2) O_(2(g)) rarr C_(2)H_(5)OH_((g))` `2C_("diamond") + 3h_(2(g)) + (1)/(2) O_(2(g)) rarr C_(2)H_(5)OH_((g))` `2C_("graphite") + 3H_(2(g)) + (1)/(2) O_(2(g)) rarr C_(2)H_(5)OH_((l))` Solution :Heat of formation is from elements in STANDARD state

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