An insulated cylinder/piston contains R-134a at 150 lbf/in 2, 120 F, with a volume of 3.5 ft3.

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An insulated cylinder/piston contains R-134a at 150 lbf/in 2, 120 F, with a volume of 3.5 ft3. The R-134a expands, moving the piston until the pressure in the cylinder has dropped to 15 lbf/in 2. It is claimed that the R-134a does 180 Btu of work against the piston during the process. Is that possible?
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