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Q.

Three thermochemical equations are given below. Based on  the data the correct relation is Cgraphite+O2g→CO2g; ΔrHº=-x kJ  mol−1Cgraphite+12O2g→COg; ΔrHº=-y kJ  mol−1COg+1/2O2g→CO2g;ΔrHº=-z kJ  mol−1

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answer is 2.

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Detailed Solution

According to Hess law, equation (i) is equal to equations (ii)+(iii).
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