1.

When a system is takenfrom state A and B along thepathACB, 80J of heat flows into the system andthe system does30 J of work . (a) How muchheatflowsintothe systemalongpathADBif theworkdoneby the system is 10? (b)Whenthe systemis returnedfrom stateB to A along curvedpath, the workdoneon the systemis 20J. Does the systemabsorbor liberate heat, andhowmuch? (c)If U_(D)- U_(A) = 40J, findthe heatabsorbed in theprocessAD and DB

Answer»


Solution :`""DeltaU = 80-30=50`
`""DeltaU` is state function
(a)`""DeltaU = q + W`
`""50=q -10`
`""or q=60J`
(b)`""DeltaU = -50`
`""DeltaU = q +w`
`""q = DeltaU- w = -70`
(c)`""DeltaU_(ABD) =DeltaU_(AD) + DeltaU_(DB)`
`""50 = 40 + DeltaU_(DB)`
`""DeltaU_(DB) = 10`
`""DeltaU_(DB)= q +w`
`""10 = q + 0 ["Vol. const".]`
`""q = 10 J`
`"""Total workin "W_(ADB)= -10`
`""W_(AD)+ W_(DB) = - 10`
`""W_(AD) = -10`
`""DeltaU_(AD) = q +w`
`""40 = q -10`
`""q = 50`


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