Definition
Any thermodynamic process, in which any system goes from an initial state to a final state and then, returns back to the initial state, is called a cyclic process.
The net energy change in a cyclic
process is zero. In this process since ΔU = 0.
From first law of thermodynamics, ΔQ = W
Thus in a cyclic process, the heat absorbed by the system is equal to the net
work done by the system.
Explanation
Let us consider that a system changes
from state A to state B, then back to state A again. For the change from A to B
, ΔU1=Ub-Ua and for the change from B to A,
ΔU2=Ua-Ub. The total energy change, ΔUtotal=ΔU1-ΔU2=(UB-Ua)+(Ua-Ub)=0
For a cyclic process, ΔH must also be zero as H is a state function.
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