Chemical Thermodynamics Question 389
Question: Combustion of sucrose is used by aerobic organisms for providing energy for the life sustaining processes. If all the capturing of energy from the reaction is done through electrical process (non P-V work) then calculate maximum available energy which can be captured by combustion of 34.2 g of sucrose Given: $ \Delta H_{combustion}( sucrose )=-6000kJmo{{l}^{-1}} $
$ \Delta S_{combustion}=180J/Kmol $ and body temperature is 300 K
Options:
A) 600 kJ
B) 594.6 kJ
C) 5.4 kJ
D) 605.4 kJ
Show Answer
Answer:
Correct Answer: D
Solution:
- No. of moles of sucrose $ =\frac{34.2}{342}=0.1 $
$ -{{(\Delta G)}_{T.P}}= $ useful work done by the system $ -\Delta G=-\Delta H+T\Delta S $
$ =+(6000\times 0.1)+\frac{180\times 0.1\times 300}{1000} $
$ =605.4kJ $
