### Example 9.2

Posted:

**Sun Jan 28, 2018 6:56 pm**The question asks: A sample of nitrogen gas of volume 20.0 L at 5.00 kPa is heated from 20. C to 400. C at constant volume. What is the change in the entropy of the nitrogen? The molar heat capacity of nitrogen at constant volume, C

The textbook solves this question by using and .

I don't understand why they use .

Thanks.

_{V, m}is 20.91 J/Kmol.The textbook solves this question by using and .

I don't understand why they use .

Thanks.