e previous l 1 of 25 l next x Item 1 Learning Goal: To understand the relationsh

Question

e previous l 1 of 25 l next x Item 1 Learning Goal: To understand the relationship between the equilibrium constant and rate constants. For a general chemical equation A B C+D the equilibrium constant can be expressed as a ratio of the concentrations If this is an elementary chemical reaction, then there is a single forward rate and a single reverse rate for this reaction, which can be written as follows forward rate kr[A] Bl reverse rate klCIDl where kr and k are the forward and reverse rate constants, respectively. When equilibrium is reached, the forward and reverse rates are equal Thus, the rate constants are related to the equilibrium constant in the following manner: CID Part A For a certain reaction, K 282x10 and ki-510x10 M calculate the value of the reverse rate constant, k,, given that the reverse reaction is of the same molecularity as the forward reaction.

Explanation / Answer

Kc = kf/kr

or, kr = kf/Kc

or, kr = 5.1*10^2/2.82*10^9 = 1.80*10^-7

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Part B

Kc = kf/kr

or, 1.74 *10^5 = 6.89*10^4/kr

or, kr = 6.89*10^4/ 1.74 *10^5 =0.395

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Part c

Equilibrium constant will decrease. In this case reverse reaction will be favored and the kr will increase and kf will decrease. As a result Kc will decrease.

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