Question

10. For which one of the following equations is
Hºreaction equal to a Hºf, for the product :-
(1) N2(g) + O2(g) - N,O2(g)
(2) CH,(g) + 2Cl2(g) - CH CI (1) + 2HCl(g)
(3) Xe(g) + 2F,(g) - XeF,(g)
(4) 2CO(g) + O2(g) - 2C02,(g)
​ please give answer with it's explaination

Answer 1

Answer:

The heat of formation is defined as the heat generated or absorbed when the compound is formed form its component elements in their standard state.

By this defination, B and D are clearly not correct as the starting materials are compounds.

A is not correct, since ozone is not correct standard state of oxygen.

So, C is the correct answer.