15) Suppose 25.0 g of HI(g) is injected into a 4.00-L reaction vessel that contains 20.0 g of I2(g). When the system comes to equilibrium at 400.°C, what will be the total pressure inside the reaction vessel? (R = 0.08206 L atm/K • mol) 2HI(g) = H₂(g) + I2(g), Kc = 0.0156 at 400.°C A) 2.70 atm B) 3.79 atm C) 13.0 atm D) 2.43 atm E) 0.815 atm​