2.3 the ideal gas equation

Question 1

The mole - ideal gas equation. The number of moles in a specific volume of a gas.

Answer 1

pV = nRT

p = pressure (Pa)
V = volume (m³)
n = number of moles (mol)
R = gas constant (given in exam)
T = temperature (K)

Question 2

(Example) Calculate the volume in cm³ of 0.36 moles of a gas at 100kPa and 298K.

Answer 2

pV = nRT rearrange to give V = nRT / p

100kPa to 100,000 Pa

V = 0.36 x 8.31 x 298 / 100000

V = 8.91x10^-3 m³

V = 8.91x10^-3 x 1,000,000 = 8910cm³

Question 3

Standard conditions of temperature and pressure.

Answer 3

298K and 100kPa.