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Two moles of an ideal gas initially has a temperature of 400 K and a volume...

Two moles of an ideal gas initially has a temperature of 400 K and a volume of 40 Liters. The gas undergoes a free adiabatic expansion to twice its initial volume.

a.) What is the entropy change of the gas?

b.) What is the entropy change of the universe?

explain please

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Answer #1

since there is a adiabatic expansion ..in adiabatic expansion there is no exchange of heat between gas and surrounding hence there is no change will be in the entropy of the gas beacuse entropy is defined as heat exchange divide by its temperature...heat exchange is zero that means there will be no change in entropy...

now what will be the change in entrop of universe..any change in the universe will lead to change in the entropy of universe. in fact entropy of universe always increased whenever any change is happened in this universe..hence there will be increase in total entropy of universe....

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