Question

Initially 5.00 mol of helium (which we can treat as an ideal
gas) occupies volume 0.120 m^{3} and is at temperature 20.0
∘C. You allow the helium to expand so that its final volume is
0.480 m^{3} and its final temperature is also 20.0 ∘C.

a)Calculate the net change in entropy of the helium if you make
the helium expand isothermally from 0.120 m^{3} to 0.480
m^{3}.

b)Calculate the net change in entropy of the helium if you first
increase the temperature of the helium so that it expands at
constant pressure from 0.120 m^{3} to 0.480 m^{3},
then cool the helium at constant volume to 20.0 ∘C.

Answer #1

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