Hydrogen iodide is produced by the reaction At a mixture of the three gases is sealed…

CHEMISTRY · Multi-part · A Level · Chemistry · Gaseous equilibria (Kp) · Gaseous equilibria (Kp)

Problem

Hydrogen iodide is produced by the reaction

H_{2}(\text{g}) + I_{2}(\text{g}) \rightleftharpoons 2\,\text{HI}(\text{g})

450\,\text{K}

a mixture of the three gases is sealed in a

1.50\,\text{L}

container. The total pressure at equilibrium is

3.00\,\text{atm}

, and the experimentally determined mole fractions of the components are:

\chi_{\text{HI}} = 0.60

\chi_{\text{H}_2} = 0.20

\chi_{\text{I}_2} = 0.20

(1) Part 1: (a) Calculate the partial pressure of each gas at equilibrium. (2) Part 2: (b) Determine the value of

K_p

for the reaction at

450\,\text{K}

. (3) Part 3: (c) Convert the value obtained in part (b) to

K_c

for the reaction at

450\,\text{K}

. (4) Part 4: (d) A second experiment is performed at

450\,\text{K}

with initial partial pressures

P_{\text{H}_2}=0.40\,\text{atm}

P_{\text{I}_2}=0.40\,\text{atm}

, and

P_{\text{HI}}=0.20\,\text{atm}

. Calculate the reaction quotient

Q_p

for this mixture and predict the direction in which the reaction will proceed to reach equilibrium, justifying your answer quantitatively.