Question

Calculate the total entropy change in 10.0 g of water as it is converted from the liquid phase at 25 0c to the gas phase at 220 0c

Answer 1

1. �has the same value irrespective of path as long as path is reversible

 

2. �is an exact differential of some function which is identical as entropy

 

3. ��

 

4. �for reversible process only

 

Calculation of Entropy change

 

1.          Entropy is a state function. The entropy change is determined by its initial and final states only

 

 

 

2.          In analyzing irreversible process, it is not necessary to make a direct analysis of actual reversible process.

 

Substitute actual process by an imaginary reversible process. The entropy change for imaginary reversible process is same as that of an irreversible process between given final and initial states.

 

 

(a) Absorption of energy by a constant temperature reservoir