The equilibrium constant
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- Write the expression for the equilibrium constant, Keq and interpret its value.
The equation for the decomposition of compound A, is below:
A (g) 2B (g) + C (g)
At 298 K, Keq = 4.5*1015
- Write an expression for Keq for this reaction.
- What does the value of Keq at 298K tell you about the reaction mixture?
- Calculate the equilibrium constant for the reaction at equilibrium.
The decomposition of PCl5 is shown by the equation below:
PCl5 (g) PCl3 (g) + Cl2 (g)
This reaction was started at room temperature (298K) by placing 0.5 mol of PCl5 in a 20 L container. When the reaction came to equilibrium, 0.3 mol of Cl2 (g) was detected.
- Find the number of moles of each substance in the equilibrium mixture.
- Calculate the equilibrium constant, Keq given the equilibrium quantities found in question a).
- Using the previous Keq equilibrium constant, what would be the equilibrium amounts of PCl3 and Cl2 if 0.8 mol of PCl5 was present?
- This equilibrium mixture is then heated up to 400K. Explain whether or not, and if so how, this will affect the Keq value.
- Calculate the reaction quotient Q and predict changes to the reaction conditions based on Le Chatelier's principle