5.1 g NH4SH is introduced in 3.0 L evacuated flask at 327ºC, 30% of the solid NH4SH decomposed to NH3 and H2S as gases. The Kp of the reaction at 327ºC is (R = 0.082 L atm mol–1 K–1, Molar mass of S = 32 g mol–1, molar mass of N = 14 g mol–1)
(1) 0.242 atm2
(2) 4.9 × 10–3 atm2
(3) 1 × 10–4 atm2
(4) 0.242 × 10–4 atm2
