Question

A 1 m³ rigid tank has propane at 100 kPa, 300 K and connected by a valve to another tank of 0.5 m³ with propane at 250 kPa, 400 K. The valve is opened and the two tanks come to a uniform state at 325 K. What is the final pressure? 

Answer 1

Propane is an ideal gas (P << P_c) with R = 0.1886 kJ/kgK