STP

STP stands for Standard Temperature and Pressure and is used to compare volumes of gases.

It is = 1 atm(atmosphere) of pressure at 0 degrees celsius or 273.15 K.

@ STP= 22.4 L IS EQUAL TO 1 MOLE OF GAS

The two conversion factors are:

1 mol of gas/ 22.4 L  & 22.4 L / 1 mol of gas

Here are some examples:

A cylinder contains 14.05 moles of gas at STP. What is the volume of the gas?

14.05 moles x 22.4 L/1 mol = 315 L