Question

Three thermochemical reactions are given below:

1. C(graphite) + O₂(g) → CO₂(g); Δ,H° = X kJ mol^-1 

2. C(graphite) + 1/2O₂(g) → CO₂(g) ΔH = Y KJ mol^-1 

3. CO(g) + 1/2 O₂(g) → CO₂(g) ΔH = Z KJ mol^-1 

What will be correct relation on the basis of these equations? 

(a) Z = X + Y 

(b) X = Y + Z 

(c) Y = 2Z - X 

(d) X = Y = Z 

Answer 1

Correct option is : (b) X = Y + Z