We can use the ideal gas equation based on the assumption that O₂ behaves similar to an ideal gas. PV = nRT P-pressure, V- volume, n - number of moles, R - universal gas constant and T - temperature number of O₂ moles - 48.0 g/ 32 g/mol = 1.5 mol temperature - 25 °C + 273 = 298 K substituting the values P x 5.2 x 10⁻³ m³ = 1.5 mol x 8.314 Jmol⁻¹K⁻¹ x 298 K P = 714.7 kPa
