Chemical Thermodynamics Question 198

Question: The heat of combustion of carbon is -94 kcal at 1 atm pressure. The intrinsic energy of $ CO_2 $ is

Options:

A) $ +94,kcal $

B) $ -,94,kcal $

C) $ +47,kcal $

D) $ -47,kcal $

Show Answer

Answer:

Correct Answer: B

Solution:

$ {C _{(S)}}+O_2 {(g)}\to CO_2 {(g)} $ , $ \Delta n _{g}=1-1=0 $

$ \therefore \Delta E=\Delta H=-94kcal $

$ \Delta E={E _{CO_2}}-(E _{C}+{E _{O_2}}) $

$ ={E _{CO_2}}-(0+0) $ or $ {E _{CO_2}}=\Delta E=-94kcal. $



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