chen discussion [ENDORSED]

[connie 2C]

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]

Do you mind posting the entire question?

[connie 2C]

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]

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

[Diana_Diep2I]

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

[ELu 1J]

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

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