Asample consisting of 0.iomol of pe rfect gas molecules is held by a piston inside a cylinder such that the volume is l.25dm3> the external pressure is constant at l .oo bar and the tempe rature is maintained at 300 kb)'a thermostat. the piston is released so that the gas can expand. calculate (a) the volume of the gas when the exp ansion is complete; (b) the work done when the gas expands; (c) the heat absorbed by the system. hence calculate