Question

When a chemical reaction is reversed the value of enthalpy is reversed in sign.

(a) true

(b) false

This question was posed to me in a job interview.

I would like to ask this question from Thermodynamics topic in division Thermodynamics of Chemistry – Class 11

Answer 1

Right option is (a) true

To explain I would say: For example, the formation of ammonia has an enthalpy of -91.8 KJ per mole and the decomposition of ammonia has an enthalpy of + 91.8 KJ per Mol. So the above statement that when a chemical reaction is reversed the value of enthalpy is reversed in the sign is true.