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Question

The heat of formation of CO(g) and CO2(g) are ΔH =- 110 and ΔH = -393 kJ.mol1 respectively. What is the heat of reaction (ΔH ) (in kJ.mol1) for the following reaction CO+12O2CO2?


A
-504
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B
-142.5
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C
-283
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D
504
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Solution

The correct option is C -283
ΔHf of CO = - 110 KJ mol1

C(s)+12O2(g)COΔH=110kJmol1
(i) C(s)+O2(g)CO2ΔH=393kJmol1

(ii) CO(g)C(s)+12O2ΔH=+110kJmol1

Adding (i) & (ii)
CO(g)+12O2(g)CO2(g)

ΔH=393+110 =283kJmol1

Option C is correct.

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