A + 2B =C.......1
E + F = 2C + D........2
1/2 E = G + 2B........3
According to hess law if we do (equation no 1 × 2) - ( equation no 2) + (equation no 3)
In the result we will reach at 2A + D = F + 2G
So ∆rH of these reaction will be -636.2 KJ mol-1
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