MATH 1.1.2-4 lb of air gain 0.491 btu/R of entropy duing a nonflow isothermal process

Question
4 lb of air gain 0.491 btu/R of entropy duing a nonflow isothermal process . if initial pressure is 120 psia and final volume is 42.5 ft^3 . find initial l volume and initial temperature, work, heat, and change in internal energy

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