Consider the reactions given below. On the basis of these reactions find out which of the algebraic relations given in options (i) to (iv) is correct?
(i) C(g) + 4H(g) \rightarrow CH_{4}(g); \Delta _{r}H=x\; kJ \; mol^{-1}
(ii)

C(graphite, s) + 2H_{2}(g) \rightarrow CH_{4}(g); \Delta _{r}H = y \; kJ \; mol ^{-1}

(i) x = y                  

(ii) x = 2y          

(iii) x >y    

(iv) x< y

Answers (1)

The answer is option (iii).  

Explanation: In the case of reaction b, the bonds are broken, but in the reaction a, the bonds are not broken. Although, same bonds are formed in both the cases.

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