Question: why when solving this problem we multiply the given mass into the work equation to find the work ? how do I know if I

why when solving this problem we multiply the given mass into the work equation to find the work ? how do I know if I have to multiply mass as well into the work equation?
V1=4s3/16 a palytropic process from p1=75/bs/m2, V1=4ft3/16 to a find state whee p2=2016f/in2) v2=9ft3/16. Determine the palytiopic exponent, in, and the anant of energy tronsfer by wark, in Btu, tor the process. Given dala: P1=75lbs/in2V1=4ft3/lbP220lbf/in2V2=95t3/lbln(P2P1=ln(V1V2)nh=ln(V1V2)ln(P2P1)ln(49)ln(2075)=11.03VW=n1[P1V1P2V2]m=1.63110[754209]0.6310[300180]=0.6310[120]
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