Question

Use the data in part a (which were collect at 460°C and are equilibrium partial pressures)...

Use the data in part a (which were collect at 460°C and are equilibrium partial pressures) to determine K for the reaction: H2 (g) + I2 (g) <---> 2 HI (g), and complete the missing information for part b.

PH2 (atm) PI2 (atm) PHI (atm)
a 6.47e-3 0.594e-3 0.0137
b 3.84e-3 1.52e-3 ?

Is K and Kp the same value for the above reaction? Please show work.

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Homework Answers

Answer #1

(a). Sol :-

Equilibrium reaction is :

H2 (g) + I2 (g) <---------> 2 HI (g)

Pressure equilibrium constant (K) is the ratio of partial pressure of products to the partial pressure of reactants raise to power stoichiometric coefficient at equilibrium stage of the reaction.

K = PHI2 / PH2.PI2

K = (0.0137 atm)2 / (6.47 x 10-3 atm).(0.594 x 10-3 atm)

K = 48.837

-----------------------------

(b).

Again,

K = PHI2 / PH2.PI2

48.837 = PHI2 / (3.84 x 10-3 atm)(1.52 x 10-3 atm)

PHI = (48.837 x 3.84 x 10-3 atm x 1.52 x 10-3 atm)1/2

PHI = 1.69 x 10-2 atm

Hence, PHI = 1.69 x 10-2 atm

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