# What is the volume occupied by 20.7 g of argon gas at a pressure of 1.04 atm and a temperature of 409 K?

##### 1 Answer

#### Explanation:

Pressure is moderate, temperature is elevated, and the gas is inert, so we would guess the ideal gas equation will give a good approximation:

The difficult part of this question is choosing the appropriate gas constant

You should (I think) always be quoted these constants in an examination, but you have to be able to use them dimensionally. If you cancel out the units in tne above exprression you get an answer in