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?
(a) C (g) + 4 H (g) → CH4 (g); ∆rH = x kJ mol–1
(b) C (graphite,s) + 2H2 (g) → CH4 (g); ∆rH = y kJ mol–1
(i) x = y
(ii) x = 2y
(iii) x > y
(iv) x < y
Option (iii) x > y is the answer.