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A quantity of 4.0 moles of an ideal gas ...

A quantity of 4.0 moles of an ideal gas at `20^(@)C` expands isothermally against a constant pressure of 2.0 atm from 1.0 L to 10.0L. What is the entropy change of the system (in cals)?

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The correct Answer is:
8
Expansion against constant pressure means the process is irreversible
`Delta S = nR l n (V_(2))/(V_(1)) = 4 xx 2 l n (10)/(1) = 18.424` cal
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