Two reactions are given below: (i) H_(2)O(g)+(1)/(2)O_(2)(g) rarrH_(2)O(l) (ii) H_(2)(g)+(1)/(2)O_(2)(g) rarr H_(2)O(g) Which one will have greater value of DeltaH and why ?

Two reactions are given below: (i) H_(2)O(g)+(1)/(2)O_(2)(g) rarrH_(2

1.	Two reactions are given below: (i) H_(2)O(g)+(1)/(2)O_(2)(g) rarrH_(2)O(l) (ii) H_(2)(g)+(1)/(2)O_(2)(g) rarr H_(2)O(g) Which one will have greater value of DeltaH and why ?
Answer» Solution :Reaction(i) will have greater value of `DELTAH`because when `H_(2)O(G)` CONDENSES to form`H_(2)O(l)` , some heatis EVOLVED( called heatof CONDENSATION).