We can use the ideal gas law equation assuming that nitrogen behaves as an ideal gas. PV = nRT P - pressure V - volume - 66.8 x 10⁻³ m³ n - number of moles - 77.8 g/ 28 g/mol = 2.78 mol R - universal gas constant - 8.314 Jmol⁻¹K⁻¹ T - temperature - 25 °C + 273 = 298 K substituting these values into the equation P x 66.8 x 10⁻³ m³ = 2.78 mol x 8.314 Jmol⁻¹K⁻¹ x 298 K P = 103.1 kPa
