chen discussion  [ENDORSED]

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connie 2C
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Joined: Thu Jul 11, 2019 12:17 am

chen discussion

Postby connie 2C » Tue Feb 04, 2020 4:26 pm

for #1, we used the equation delta s= nRln(V2/V1). what is n equal to in the problem? is it equal to 1 because we are calculating molar entropy?

Michelle Song 1I
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Joined: Thu Jul 11, 2019 12:17 am

Re: chen discussion

Postby Michelle Song 1I » Tue Feb 04, 2020 6:05 pm

Do you mind posting the entire question?

connie 2C
Posts: 106
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Re: chen discussion

Postby connie 2C » Wed Feb 05, 2020 12:20 pm

the question is "calculate the change in molar entropy of carbon dioxide that is allowed to expand isothermally to 10 times its initial volume (treat carbon dioxide as an ideal gas, Cv,m=3/2R)"

Chem_Mod
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Re: chen discussion  [ENDORSED]

Postby Chem_Mod » Thu Feb 06, 2020 11:11 am

Yes, molar entropy means entropy for 1 mole of substance. So number of mole equals to one in this question.

Diana_Diep2I
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Re: chen discussion

Postby Diana_Diep2I » Thu Feb 06, 2020 9:03 pm

When do we use C and when do we use R?

ELu 1J
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Joined: Thu Jul 25, 2019 12:16 am

Re: chen discussion

Postby ELu 1J » Thu Feb 06, 2020 9:05 pm

Diana_Diep2I wrote:When do we use C and when do we use R?

C = 3/2R at constant volume and C = 5/2R at constant pressure.


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