Question

The thermal effect of the water formation reaction is 286 kj.what will be the thermal effect of its decomposition?why?

Answer 1

-286 kJ

Step-by-step explanation:

The formation and the decomposition of water are opposite reactions, which have the same number of bonds. The difference in that in the formation the bonds are being formed, and in the decomposition, the bonds are being broken. The thermal effect has the same value, but different direction, so different signal.