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B
−26.4kcal
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C
41.2kcal
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D
−41.2kcal
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Solution
The correct option is A−26.4kcal According to Hess's law, the total heat changes occuring during a chemical reaction are independent of path. 2CO(g)+O2(g)⟶2CO2(g)N , ΔH=−135.2 kcal
The above reaction is reversed and halved, we get- CO2(g)⟶CO+12O2(g) ΔH=135.22 kcal ....(i)