C(s) + O2(g) → CO2(g), ΔH = −94 kcal/mol
One mole of carbon liberates 94 kcal of heat when it undergoes complete combustion.
Calculating amount of carbon:
n(C)=M(C)m(C)=12molg23.0g=1.92mol
Thus the given amount of carbon will generate
Q=−ΔH⋅n(C)=94molkcal⋅1.92mol=180.5kcal=1.805×102kcal
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