JEE Main 2016 Chemistry question
The heats of combustion of carbon and carbon monoxide are and kJ mol, respectively. The heat of formation (in kJ) of carbon monoxide per mole is:
Answer: (2)
Solution
Write the two given reactions:
(i)\ C(s) + O_2(g) → CO_2(g), Δ H = -393.5\ kJ mol^{-1}
(ii)\ CO(g) + 12O_2(g) → CO_2(g), Δ H = -283.5\ kJ mol^{-1}
The formation of CO is \frac$12O_2(g) →
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