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. $



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