Compounds with high heat of formation are less stable because

Options

A. high temperature is required to synthesise them
B. molecules of such compounds are distorted
C. it is difficult to synthesise them
D. energy rich state leads to instability

Answer

D

Explanation

Heat of formation is the heat evolved or absorbed when one mole of a matter is formed from its constituent elements. Positive value of heat of formation indicates that the compound is less stable than its elements. Negative value of heat of formation indicates that the compound is associated with less energy as compared to its constituents and the compound is more stable. A high energy system is unstable. it tends to undergo spontaneous change in order to acquire a state of minimum energy and maximum stability.