At a certain temperature, the equilibrium constant, ?c,Kc, for this reaction is 53.3.   H2(g)+I2(g)↽−−⇀2HI(g)?c=53.3H2⁡(g)+I2⁡(g)⁢↽−−⇀⁢2HI(g)⁢Kc=53.3   At this temperature, 0.400 mol H20.400 mol H2 and 0.400 mol I20.400 mol I2 were placed in a 1.00 L container to react. What concentration of HIHI is present at equilibrium? [HI]=

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