Q. 31

A sample of 1.0 mol of a monoatomic ideal gas is taken through a cyclic process of expansion and compression as shown in Fig. 6.1. What will be the value of ΔH for the cycle as a whole?



Answer :

Enthalpy or H is a state function, which means it does not depend on the path on which a process is carried out. Instead, it depends on the initial and final state of a process and changes accordingly.


In the following cyclic ( 1 2 3 1 ) process the initial and final point is the same (i.e. 1). Hence the enthalpy change or ∆H= 0, in other words, there will be no change in enthalpy.


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