Question

True or False

The change in enthalpy of a hypotehtical reversible process and the change in enthalpy of it's representative actual processes are equal?

Entropy production is greater for an irreversible process than a reversible process?

Answer 1

1.The change in enthalpy of a hypotehtical reversible process and the change in enthalpy of it's representative actual processes are equal?

=>The given statement is FALSE.

For a given reversible reaction A=B

The change in enthalypy of its hypothetical process is generally smaller than the actual process.Because in actual process we generally take into consideration 'the heat envolved in the reaction' while in hypothetical model,we generally neglect this heat envolved term which results in increase in the enthalpy in case of actual process model.

2.Entropy production is greater for an irreversible process than a reversible process?

=>The given statement is TRUE.

Based on clausius inequality, lets say dS repersents the change in entropy:so according to clausius inequality:

dS=0 (reversible process) an dS>0 (for irreversible process)

For reversible process:the change in entropy of the system is ZERO.

while for an irreversible process ,the change in entropy of the system is always POSITIVE.

hence,we can say that:Entropy production is greater for an irreversible process than a reversible process... Therefore the given statement is TRUE.

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