🎴 Flashcard Mode
Bond enthalpies - class-XII
Card1 / 55
Mastered0
Review0
QuestionClick to flip
The enthalpies of combustion of carbon and carbon monoxide are -393.5 KJ and -283 KJ respectively the enthalpy of formation of carbon monoxide is :
AnswerClick to flip back
A
-110.5 KJ
💡 Explanation:
The enthalpy of formation of carbon monoxide is calculated using Hess's law by subtracting the enthalpy of combustion of carbon monoxide from that of carbon. Specifically, delta H_f(CO) = delta H_c(C) - delta H_c(CO) = -393.5 - (-283) = -110.5 kJ. This represents the energy change when one mole of carbon monoxide is formed from its elements.