Question

balance the equation
68 kcal + O2(g) <-> O3(g) + 31 kcal

Answer 1

To balance the equation we need multiply left part by 3 and right partby 2:
3*68 kcal +3 O₂(g) <-> 2 O₃(g) + 2*31 kcal
After simplifying we obtain the final result:
3 O₂(g)<-> 2 O₃(g) - 142 kcal