A 5-L vessel contains 14 g of nitrogen. When heated to 1800 K, 30% of molecules are dissociated into atoms. Calculate the pressure of the gas at 1800 K.
N2 ⇌ 2N Initial moles = 1.428 = 0.05 Moles left = 0.05 – 30100 × 0.05 = 2 × 0.015 = 0.03 ∴ Total no. of moles = 0.035 + 0.030 = 0.065 i.e. n = 0.065 mol, V = 5 L, T = 1800 K; P =? P = nRTV=0.065×0.0821×18005 = 1.92 atm.
