Air within a piston-cylinder assembly, initially at 33 lbf/in², 510°R, and a volume of 6 ft³, is compressed isentropically to a final volume of 3 ft³. Assuming the ideal gas model with k = 1.4 for the air, determine the: (a) mass, in lb. (b) final pressure, in lbf/in² (c) final temperature, in °R (d) work, in Btu.

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