One mole of an ideal monoatomic gas at 27°c is allowed to expand into vaccum from 10 litre to 20 litres;and onle mole of the same gas expands isothermally and r

One mole of an ideal monoatomic gas at 27°C is allowed to expand into vaccum from 10 litre to 20 litres;and onle mole of the same gas expands isothermally and reversibly from the same initial to the same final volume. calculate Q and W in both the cases.