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Two litres of an ideal gas at a pressure...

Two litres of an ideal gas at a pressure of 10 atm expands isothermally into a vacuum until its total volume is 20 litres. How much heat is absorbed and how much work is done in the expansion?

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Pressure of gas 10 atm.
`q=-W=PDeltaV`
Since the gas expands into vacuum the pressure, P = 0
`therefore q=-W=0(20-2)=0`
`therefore` Heat change and work done are zero.
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