An ideal gas is taken through the cycle `A rarr B rarr C rarr A` As shown in figure. If net heat supplied to the gas in the cycle is 5j. Find the work done by the gas in the process `C rarr A` in Joule (taken mole value)

Options

A. `-5 J`
B. `-10 J`
C. `+15J`
D. `-20 J`

Answer

A

Explanation

`q=DeltaU+(-W_(T))`
`:'DeltaU=0` (`:'`cyclic process)
`q=W_(r)`
`=[W_(AB)+W_(BC)+W_(CA)]`
`W_(AB)=PDeltaV,W_(BC)=0`
`5=[10+0+W_(CA)]`
or `W_(CA)=-5 J`