The equilibrium constank K p for thereaction H 2 (g) + I 2 (g) --> 2HI (g) <---

Question

The equilibrium constank Kp for thereaction H2 (g) + I2 (g) --> 2HI (g)                       <--- is 55.2 at 425 degrees celsius. A rigid cylinder at thattemperature constains 0.127 atm of hydrogen, 0.134 atm of iodine,and 1.055 atm of hydrogen iodide. Is the system atequilibrium? why? a) yes b) no, the forward reaction mut proceed to establishequilibrium c)No, the reverse raction must proceed to establishequilibrium d) the volume of the container must be known beforedeciding e) the starting concentrations of all substances must be knownbefore deciding The equilibrium constank Kp for thereaction H2 (g) + I2 (g) --> 2HI (g)                       <--- is 55.2 at 425 degrees celsius. A rigid cylinder at thattemperature constains 0.127 atm of hydrogen, 0.134 atm of iodine,and 1.055 atm of hydrogen iodide. Is the system atequilibrium? why? a) yes b) no, the forward reaction mut proceed to establishequilibrium c)No, the reverse raction must proceed to establishequilibrium d) the volume of the container must be known beforedeciding e) the starting concentrations of all substances must be knownbefore deciding

Explanation / Answer

Use the value given for Kp and plug in the givenpressures to the equation to determine if it is inequilibrium. Kp = [HI]2/[H2][I2] Kp = (1.0552)/(0.127)(0.134) Kp = 65.4 Since they tell us that Kp at equilibrium is 55.2, andthe given pressures provide a Kp of 65.4, we canconclude that the system is not in equilibrium. The Kpwe have is larger than what it should be. Mathematically, thismeans that the numerator is too large. This indicates that there istoo much product, so we need to reduce the amount of roduct byallowing the reaction proceed in the reverse direction, thusconsuming some product and decreasing Kp.

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