CONCEPT PROBLEMS SET 4.docx

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CONCEPT PROBLEMS SET 4 1. Explain, in words, how to use the graph to determine when the reaction has reached equilibrium. Explain, in words, how this information can be used to determine a value for the equilibrium constant. The graph can be used to find the reaction equilibrium by finding at what point in time the slope of the graph is horizontal or when the slope is equal to a constant number. This is where the reaction is at equilibrium because there is no change in slope of either of the reactants or the products and therefore no change in the reaction. The equilibrium constant could be determined by using the formula , and plugging in values of these reactants at their points of equilibrium. But you would have to be sure you converted out of mole % to strictly moles and then divided by the volume to make sure the concentrations are in Molarity (mol/L). 2. In lecture, you will observe the following system, at equilibrium, in a sealed tube. NO(g) + NO2 (g) N2O3 (g) Kc (25 C) = 0.55 Suppose you wanted to use this reaction to synthesize a large amount of N2O3 . Unfortunately, the magnitude of the
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