Chemical Thermodynamics Question 345

Question: Following reaction occurrs in an automobile $ 2C_8H_{18}( g )+25O_2( g )\to 16CO_2( g )+18H_2O( g ). $ The sign of $ \Delta H,\Delta S $ and AG would be

Options:

A) $ +,-,+ $

B) $ -,+,- $

C) $ -,+,+ $

D) $ +,+,- $

Show Answer

Answer:

Correct Answer: B

Solution:

For combustion reaction, $ \Delta H $ is negative, $ \Delta n=( 16+18 )-( 25+2 )=+7 $ , so $ \Delta S $ is +ve, reaction is spontaneous, hence $ \Delta G $ is -ve.



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