A cylinder has a piston at one end that can be moved in or out to change the volume of gas inside. The other end is fitted with a valve. Initially the cylinder contains 4.35 mol of an ideal gas. The piston is now pushed in to decrease the volume of gas to two-fifths its initial value without causing any change in temperature. In order to keep the pressure constant as well, how many moles of gas need to be released through the valve?

 

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piston cylinder -valve piston cylinder -valve

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