A vessel of volume contains an ideal gas at 300K and 200 kPa. The gas is allowed to leak until the pressure falls to 125 kPa. Calculate the amount of the gas (in moles) leaked assuming that the temperature remains constant.
As he gas leaks out, the volume and the temperature of the remaining gas do not change. The number of moles of the gas in the vessel is given by .
The number of moles in the vessel before the leakage is .
The number of moles in the vessel after the leakage is .
Thus, the number of moles leaked is
.
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Two identical containers A and B have frictionless pistons. They contain the same volume of an ideal gas at the same temperature. The mass of the gas in A is mA and that in B is mB. The gas in each cylinder is now allowed to expand isothermally to double the initial volume. The change in the pressure in A and B, respectively, is p and 1.5 p. Then
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