Entropy chance with a carnot cycle?

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Homework Help Overview

The discussion revolves around a Carnot cycle involving an adiabatic expansion of gas from 200 degrees to 500 degrees. Participants are exploring the efficiency of the cycle and the entropy change associated with the expansion.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to calculate the efficiency and seeks guidance on determining the entropy change. Some participants question the assumption that entropy remains constant during an adiabatic process.

Discussion Status

There is ongoing exploration of the relationship between adiabatic processes and entropy change. Some participants suggest that the entropy change may be zero, while others are still seeking clarification and advice on the topic.

Contextual Notes

Participants are navigating the implications of adiabatic conditions on entropy and are considering the definitions and equations relevant to the problem.

coffeem
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in a carnot cycle the gas expands adiabatically from 200 degrees to 500 degrees. what is the efficecy? and what is the entropy change of the gas during the expansion?

sorry - i got the efficiency to be: 38.8%

however I am unsure how to work out the entropy chance? any hints?
 
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however my thinking is that if the the system is adiabatic... then the entropy will stay constant... then it will be 0? am i on the right lines? thanks
 
Hi I am still struggling with this. any advice? thanks
 
coffeem said:
however my thinking is that if the the system is adiabatic... then the entropy will stay constant... then it will be 0? am i on the right lines? thanks

If ΔS=dQ/T and dQ=0 for an adiabatic process then ΔS=0. So you are right.
 

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