A 700 g quantity of an ideal gas undergoes a reversible isothermal compression at a temperature of 330 K The compression reduces the volume of the gas from 0.40 m3 initially, to 0.15 m3 finally. The molecular mass of the gas is 380 g/mol What is the entropy change for the gas, in SI units?

Refrigerant-134a flows through a carnot heat pump cycle at 0.5 kg/s. it is known that the maximum absolute temperature in the cycle is 1.1 times the minimum absolute temperature, and the net power input to the cycle is 2.5 kw. if the refrigerant changes from a saturated vapor to a saturated liquid during the heat rejection process, determine the maximum magnitude of the enthalpy of vaporization for this process in kj/kg (with 3 significant figures).