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Caculate the standard heat of formation of ethane at constant volume. Given that heat of formation at constant pressure is -26.4 kcal..R=0.002

Caculate the standard heat of formation of ethane at constant volume. Given that heat of formation  at constant pressure is -26.4 kcal..R=0.002

Grade:12th pass

1 Answers

Samyak Jain
333 Points
5 years ago
Standard heat of formation of ethane at constant pressure is qp = cp.dT.
cv and cp values of polyatomic gas (here, ethane) are 6R and 7R respectively.
So, cp.dT  =  7R dT  =  – 26.4 kcal   \Rightarrow  R dT  =  (– 26.4)/7 kcal
Standard heat of formation of ethane at constant volume is qv =  cv.dT  =  6R dT
     =  6.(– 26.4)/7  \approx  – 22.63 kcal.

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