Problem 4.12 from book applied thermodynamics for engineer and technologists Td Eastop and McConkey

1 kg of air at 1.013 bar, 17 C, is compressed according to a law pt.' 3 = constant, until the pressure is 5 bar. Calculate the change of entropy and sketch the process on a T-s diagram, indicating the area which represents the heat flow.
(-0.0885 kj/kg)