# A sample of neon has a volume of 75.8 at STP. How many moles are present?

##### 1 Answer

3.38 moles are present

#### Explanation:

**I am going to assume that you mean 75.8 L since there are no units associated with the volume you provided.**

Because we are at standard temperature and pressure and are given only one set of conditions, we can to use the ideal gas law equation:

I should mention that the pressure does not always have units of atm, it depends on the units of pressure given in the gas constant.

List your known and unknown variables.

- Volume

- Temperature

- Pressure

Moles of neon

At STP, the temperature is 273K and the pressure is 1 atm.

Let's rearrange the equation to solve for n: