• 0.06 m3 of ethane, at 6.9 bar and 260 °C is allowed to expand isentropically in a cylinder behind a piston to a pressure of 1.05 bar and a temperature of 107 °C. Calculate 
• a) ϒ, R, cp and cv
•  b) Work done during expansion. The same mass of ethane at same pressure and temperature is compressed to 6.9 bar according to the law pv1.4 = constant. Calculate: 
• c) The final temperature of the ethane. 
• d) Heat flow to or from the cylinder walls during the compression. 
• e) Calculate also the change of entropy during the compression 
• f) Sketch both processes on p-v and T-s diagram
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