2 moles of Argon gas is taken in a cylinderfitted with massless and frictionless pistonand occupies a volume of 5 3dm at 298 K.The gas undergoes isothermal reversibleexpansion to 25 3dm . If the gas behavesideally, calculate the molar entropy changefor the process

1 mole of an ideal gas at 25°C is subjected to expands reversibly 10 times of its initial volume. What is the change in entropy _________ JK-1

Two moles of an ideal gas is expanded isothermally and reversibly from 1 litre to 10 litre at 300 K. The enthalpy change ( in kJ) for the process is

Q2. A piston-cylinder contains 1.5 kg of saturated liquid water at 3 MPa. The water is heated at constant pressure until it reaches becomes a saturated vapour. The piston expands quasi-statically. Assume there is no entropy generated in the water (Sgen=0). a) What is the change in entropy of the water? b) How much heat was added? (Hint: use entropy balance.) c) Why would we assume Sgen=0?

One kg of an ideal gas (gas constant, R = 400 J/kg.K; specific heat at constant volume, Cv=1000 kj/kg.K at 1 bar, and 300 K is contained in a sealed rigid cylinder. During an adiabatic process, 100kJ of work is done on the system by a stirrer. The increase in entropy of the system is _________ J/K.:

An air-filled piston-cylinder undergoes a polytropic compression. Initially, the air is at a pressure of 3 bar, temperature of 324 K and the gas occupies a volume of 69 cm3. After compression, the volume is reduced to 17 cm3 and the specific entropy of the air is reduced by  = -0.1152 kJ kg-1 K-1. Estimate the temperature after the compression, give your answer in Kelvin to the nearest whole number.