### 8.31

Posted:

**Sun Jan 22, 2017 9:49 pm**Q 8.31: "Calculate the heat released by 5.025 g of Kr (g) at 0.400 atm as it cools from 97.6 degrees C to 25 degrees C at a constant pressure"

The solution for this question says "The molar heat capacity of a monatomic ideal gas at constant is C=5/2R."

Where was this number derived from? Is it simply something we should know, or is there a way to prove this?

The solution for this question says "The molar heat capacity of a monatomic ideal gas at constant is C=5/2R."

Where was this number derived from? Is it simply something we should know, or is there a way to prove this?