**Using the ideal gas equation**

Using the equation, the volume of one mole of gas at any temperature and pressure can be calculated. Since none of the terms of the equation refers to a particular gas, this volume will be the same for any gas.

It is the space between the gas molecules that accounts for the volume of a gas. Even the largest gas particle is extremely small compared with the space in between the particles.

To find a volume: V = nRT/P

**Example**

If the temperature is 20.0 degrees C, pressure = 100,000 Pa and n=1 for one mole of gas:

V = (8.31JK^-1 mol^-1 * 293 K)/ 100,000 Pa

= 0.0243m^-3 = 0.0243 * 10^6 cm^3 = 24300 cm^3

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