Hydrogen, iodine and hydrogen iodide are in equilibrium in a sealed tube at constant temperature. The equation for the reaction is:

H₂ + I₂ ⇋ 2HI(g)      ΔH_r = –96 kJ mol^–1

The partial pressures of each gas are shown in the table below.

a. Explain the meaning of the term partial pressure.

b. Calculate the total pressure of the three gases in this mixture.

c. Write an equilibrium expression for this reaction in terms of partial pressures.

d. Calculate a value for K_p for this reaction, including the units.

e. Use Le Chatelier’s principle to explain what happens to the position of equilibrium in this reaction when:

i. The temperature is increased

ii. Some iodine is removed.

Transcribed Image Text:

Gas Partial pressure /Pa H2 2.330 x 106 0.925 x 106 HI 10.200 x 106