Chemical Thermodynamics Question 218
Question: The standard heats of formation in kcal $ mo{{l}^{-1}} $ of $ NO_2(g) $ and $ N_2O_4(g) $ are 8.0 and 2.0 respectively. The heat of dimerization of $ NO_2 $ in $ kcal $ is $ 2NO_2(g)=N_2O_4(g) $ [NCERT 1983]
Options:
A) 10.0
B) - 6.0
C) - 12.0
D) - 14.0
Show Answer
Answer:
Correct Answer: D
Solution:
$ \Delta {H_{reaction}}=\Delta H_{f}^{0},(N_2O_4)-2\Delta H_{f}^{0},(NO_2) $
$ =2-2,(8)=-14kcal. $
