Methane and hydrogen sulfide react to form carbon disulfide and hydrogen, like this: CH₂(g) + 2H₂S (g) → CS₂(g)+4H₂(g) Suppose a mixture of CH4, H₂S, CS₂ and H₂ has come to equilibrium in a closed reaction vessel. Predict what change, if any, the perturbations in the table below will cause in the composition of the mixture in the vessel. Also decide whether the equilibrium shifts to the right or left. perturbation Some H₂ is removed. Some H₂S is added. change in composition The pressure of CH4 will The pressure of H₂S will The pressure of CH4 will The pressure of CS₂ will ? ? ? ? C C C © shift in equilibrium X to the right Oto the left O (none) Oto the right Oto the left O (none) S

Ammonia and oxygen react to form nitrogen and water, like this: 4NH, (g)+30, (g) → 2N,(g)+6H,0(g) Suppose a mixture of NH2, O,, N, and H,0 has come to equilibrium in a closed reaction vessel. Predict what change, if any, the perturbations in the table below will cause in the composition of the mixture in the vessel. Also decide whether the equilibrium shifts to the right or left. ol perturbation change in composition shift in equilibrium A to the right The pressure of O, will to the left Some NH, is removed. The pressure of N2 will O (none) to the right The pressure of NH3 will to the left Some N, is added. The pressure of O, will ? O (none)

Consider the following chemical equilibrium: A(s) +  B(g) ⇄ 3 C(s) + 4 D(g) If the initial pressure of B is 4.26 bar, the total pressure at equilibrium is 7.15 bar. Use these pressures to calculate Keq.

KINETICS AND EQUILIBRIUM Using Le Chatelier's Principle to predict the result of changing... Nitrogen and hydrogen react to form ammonia, like this: N₂(g) +3 H₂(g) →2NH₂(g) The reaction is exothermic. Suppose a mixture of N₂, H₂ and NH3 has come to equilibrium in a closed reaction vessel. Predict what change, if any, the perturbations in the table below will cause in the composition of the mixture in the vessel. Also decide whether the equilibrium shifts to the right or left. perturbation change in composition The temperature is raised. The pressure of NH3 will ? The temperature is lowered. The pressure of N₂ will ? ? go up. go down. not change. shift in equilibrium to the right to the left O (none) to the right to the left O (none) X 1/5