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.ºC,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.ºC
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