Q. A mixture of two moles of carbon monoxide and one mole of oxygen, in a closed vessel is ignited to convert the carbon monoxide to carbon dioxide. If $\mathrm{\Delta}H$ is the enthalpy change and $\mathrm{\Delta}E$ is the change in internal energy, then
A) $\mathrm{\Delta}H > \mathrm{\Delta}E$
B) $\mathrm{\Delta}H < \mathrm{\Delta}E$
C) $\mathrm{\Delta}H = \mathrm{\Delta}E$
D) The relationship depends on the capacity of the vessel
Explanation
(b)
Formation of $CO_{2}$ from CO is an exothermic reaction. Heat is evolved from the system $ie,$ energy is lowered thus exothermic reactions occur spontaneously on account of decrease in enthalpy of system. Thus, $\mathrm{\Delta}E > \mathrm{\Delta}H$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.