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The heat of formation CO and CO2 are -26.4 Kcal and -94 Kcal respectively. Heat of combustion of carbon monoxide will be …

(a) + 26.4 K Cal 

(b) – 67.6 K Cal 

(c) – 120.6 K Cal 

(d) + 52.8 K Cal

1 Answer

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Best answer

(b) -67.6 K Cal

C + 1/2 O2 → CO ∆H = -26.4 K.cal … (1) 

C + O2 → CO2 ∆H = -94 K.cal …(2) 

Heat of combustion of CO is 

C + 1/2 O2 → CO2 ∆H = ? 

Equation (1) is reversed.

ΔH= -67.6 K. cal

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