For this question we can use the ideal gas equation, PV = nRT P - pressure V - volume - 66.8 / 1000 m³ n - number of moles - 77.8 g/ 28 g/mol = 2.77 mol R - universal gas constant - 8.314 Jmol⁻¹K⁻¹ T - 25 °C + 273 = 298 K substituting these values in the equation P x 0.0668 m³ = 2.77 mol x 8.314 Jmol⁻¹K⁻¹ x 298 K P = 102.7 kPa
