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calculate the work done by a gas as it is taken from the state a to b, b to c and c to a as shown in

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The work done by the gas in the process a to b is the area of adde. This is
`W_(ab)=(120kPa)(250_(cc)`
`=120xx10^(3)xx250xx10^(-6)J=30J`.
In the process c to a the gas is compressed. The volume is decreased and the work done by the gas is negative.the magnitute is equel to the area of caed. this area is cab + baed
`=(1)/(2)(20 kPa)(250 cc)+30J`
`10J+30J=40J`.
Thus, the work done in the process c to a is-40J.
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