# Question: a mass of 8 kg gas expands within a flexible...

###### Question details

A mass of 8 kg gas expands within a flexible container so that the p-v relationship is of the form pv1.2=const. The initial pressure is 1000 kPa and the initial volume is 1 m3. The final pressure is 5 kPa. If specific internal energy of the gas decreases by 40 kJ/kg, find the magnitude and direction of heat transfer.