1. One mole of an ideal gas at 10 atm pressure is contained in a vessel at 300K. The gas is expanded till the pressure becomes 2 atm and the temperature reaches 400K. Calculate the work done on the system and the heat absorbed by it if the change is brought about by the following processes: A] The gas is expanded isothermally against a constant external pressure of 2 atm, then heated to the desired temperature at constant volume, and finally expanded till the final state is reached. B] The gas is expanded by an isothermal reversible process, then heated to 400K, and again expanded reversibly till he final state is reached. C] The gas is first heated in an isochoric process and then expanded reversibly in an isothermal process.

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Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.