Question: A 35 ft3 rigid tank has propane at 15 psia, 540 R and connected by a valve to another tank of 20 ft3 with propane

A 35 ft3 rigid tank has propane at 15 psia, 540 R and connected by a valve to another tank of 20 ft3 with propane at 40 psia, 720 R. The valve is opened and the two tanks come to a uniform state at 600 R. What is the final pressure?

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