# What is the volume of an ideal gas at STP, if its volume is #"2.85 L"# at #14^@ "C"# and #"450 mm Hg"#?

##### 1 Answer

The volume at STP is

#### Explanation:

This is an example of the **combined gas law**, which combines Boyle's, Charles', and Gay-Lussac's laws. It shows the relationship between the pressure, volume, and temperature when the quantity of *ideal* gas is constant.

The equation to use is:

https://en.wikipedia.org/wiki/Gas_laws

**Housekeeping Issues**

**Current STP**

Standard temperature is

The Kelvin temperature scale must be used in gas problems. To convert temperature in degrees Celsius to Kelvins, add

The pressure in

I'm giving the pressure to three sig figs to reduce rounding errors.

**Organize the data:**

**Known**

**Unknown**

**Solution**

Rearrange the combined gas law equation to isolate