1. Choose the statement below that is FALSE A. When K>1, the forward reaction is
ID: 542955 • Letter: 1
Question
1. Choose the statement below that is FALSE A. When K>1, the forward reaction is favored and essentially goes to completion. B. When K 1 implies that the reaction is very fast at producing products. E. None of the above are false. 2. Express the equilibrium constant for the following reaction: 16 CH3CIg)+8 Cl2g) 16 CH2CI2(g)+8 H2(g) [CH2C12lH2] 113C1][C12] A.K = [CH2C12116[H2 18 C. K = [CH2Cl2]101H218 ICH3CIJICI2] CH3C12(Cl2] E. K = [CH2Cl2]12[H2] 3· The equilibrium constant is given for one of the reactions below. Determine the value of the missing equilibrium constant. H2(g) + Br2(g) 2 HBr(g) 2HBr(g)=H2(g) + Br2(g) Kc = 3.8 × 104 Kc ?Explanation / Answer
1)option D
The state of equilibrium does not tell us how fast the reaction goes but the value of K tells us to what extent the reactiongoes.
Thus if K>>1 , it means the product concentration is more than reactant concentration , but it does not tell us that the reaction proceeds faster.
Even on addition of catatlyst also the position of equilibrium ( equilibrium concentrations of reactants and products) does not change but the time required to attain equilibrium is shortened.
5)The relation between Kp and Kc is
Kp = Kc (RT)delta n
Thus kp =Kc for a reaction whose delta n = 0 , as (RT)0 = 1
The reaction with delta n = 0 is optionB only.
7) OPtion A
When the rate of forward reaction is equal to rate of backward reaction in a reversible reaction, we say it is at equilibrium.
THis equilibrium is called dynamic equilibrium , because both forward and backward reactions are goingon at equal speed and overall we dont see any change in observable properties like color, concentration, pressure or density of the reaction mixture and it appears that the reaction is stopped. HOwever both the reactions are going on with equal speed.
The equilibrium constant for reverse reaction is reciprocal of equilibrium constant for forward reaction.
If Q > K backward reaction is favored.
At dnamic equilibrium only rates of forward and reverse reactions are equal not the concentrations of reactants and products.
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