Chemical Thermodynamics Question 92
Question: 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 $ \Delta H $ is the enthalpy change and $ \Delta E $ is the change in internal energy, then [KCET 2005]
Options:
A) $ \Delta H>\Delta E $
B) $ \Delta H<\Delta E $
C) $ \Delta H=\Delta E $
D) The relationship depends on the capacity of the vessel
Show Answer
Answer:
Correct Answer: B
Solution:
Formation of $ CO_2 $ from $ CO $ is an exothermic reaction; heat is evolved from the system, i.e., energy is lowered. Thus, exothermic reactions occur spontaneously on account of decrease in enthapy of system. Thus, $ \Delta E>\Delta H $ .
