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Constructed Response Topic 9 : Kinetic and Equilibrium

Set J: Equilibrium, Le Chatelier’s Principle, collision theory

Base your answers to questions 25 through 27 on the information below.

Nitrogen gas, hydrogen gas, and ammonia gas are in equilibrium in a closed container at

constant temperature and pressure. The equation below represents this equilibrium.

N2(g) + 3H2(g < ====== > 2NH3(g)

The graph below shows the initial concentration of each gas, the changes that occurs as

a result of adding H2(g) to the system, and the final concentration when equilibrium is

reestablished.

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25. What information on the graph indicates that 25.

the system was initially at equilibrium?

26. Explain, in terms of Le Chatelier’s Principle, why 26.
the final concentration of NH3(g) is greater than

the initial concentration of NH3(g)

27. Explain, in terms of collision theory, why the 27.

concentration of H2(g) begins to decrease

immediately after more H2(g) is added to the

system.

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