We can use the ideal gas law equation to find the volume of N₂ gas at STP PV = nRT where P - standard pressure - 101 325 Pa V - volume n - number of moles - 21.0 g / 28 g/mol = 0.750 mol R - universal gas constant - 8.314 Jmol⁻¹K⁻¹ T - standard temperature - 273 K substituting the values in the equation 101 325 Pa x V = 0.750 mol x 8.314 Jmol⁻¹K⁻¹ x 273 K V = 16.8 L volume of N₂ at STP is 16.8 L
