The heats of combustion of carbon and carbon monoxide are - 393.5 a n d - 283.5 k J m o l - 1 , respectively. The heat of formation in kJ of carbon monoxide per mole is:

Question

TestHub · Accepted Answer

Given: Heat of combustion of carbon and carbon monoxide are $- 393.5 a n d - 283.5 k J m o l^{- 1},$ respectively.

(i) $C + O_{2} \to C O_{2}; ∆ H_{1} = - 393.5 k J m o l^{- 1}$

(ii) $C O + \frac{1}{2} O_{2} \to C O_{2}; ∆ H_{2} = - 283.5 k J m o l^{- 1}$

To find the heat of formation of $CO$ per mole.
$C + \frac{1}{2} O_{2} \to C O$
$Δ H_{f}$ of $CO$

From equations (i) and (ii),
$=-393.5- (- 283 .5)$
$= - 110$ $kJ {mol}^{- 1}$

Chemistry - Thermochemistry Question with Solution | TestHub

Options:

Doubts & Discussion