Question: Helium gas expands from 20 psia, 600 R and 9 ft3 to 15 psia in a polytropic process with n = 1.667. How much heat

Helium gas expands from 20 psia, 600 R and 9 ft3 to 15 psia in a polytropic process with n = 1.667. How much heat transfer is involved?

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