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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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The correct Answer is:
We have q= -w = `P_(ex)` (10-2) =0(8) =0
No work is done; no heat is absorbed.
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