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In which of the following reactions, heat liberated is known as standard heat of formation of CO₂ ?

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2CO_(g) + O_2(g) $\overset{}{\to}$ 2CO_2(g) +135.6 kcals

C_(diamond) + O_2(g) $\overset{}{\to}$ CO_2(g) + 94.5 kcals

C_(graphite) + O_2(g) $\overset{}{\to}$ CO_2(g) + 94.05 kcals

CH_4(g) +2O_2(g) $\overset{}{\to}$ 2CO_2(g) +2H₂O_(l) +2128 kcals

answer is C.

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Detailed Solution

When one mole of compound is formed from its constituent elements all being under standard conditions the enthalpy change is known as standard heat of formation

For carbon standard condition is graphite and CO₂ is gas

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