# How many atoms are contained in 16.80 L of Xe at STP?

##### 1 Answer

The answer is

This problem can be solved either by using the ideal gas law, **STP**.

If one were to use the ideal gas law, it is important to know that **STP** means a pressure of **1.00 atm** and a temperature of **273.15K**. In order to determine the number of atoms, we need to first determine the number of moles

Since 1 mole of any substance has exactly *Avogadro's number*), we can determine the number of atoms by

The second method uses the fact that 1 mole of **any ideal gas** occupies **STP**. We could determine the number of moles by

And, once again