Which of the following are true statements ? a) For a reactionwhere K c >> 1, th

Question

Which of the following are true statements ? a) For a reactionwhere Kc >> 1, the initial concentrationof reactant is 0.125 M.
When equilibruim has been achieved, this concentration will havechanged
by only a negligible amount b) For a chemical reaction whereKc ˜ 1, , there will be significantconcentrations
of both reactant and product species when equilibruim has beenachieved c) For a reaction where Kc << 1,the initial concentration of reactant is 0.0489 M.
When equilibruim has been achieved, this concentration will havebeen reduced to a much
smaller value d) A catalyst can reduce the time a given reactiontakes to reach equilibrium, but in doing so will cause
different equilibrium concentrations than those achieved withoutthe use of the catalyst

Explanation / Answer

      of reactants will drop steeply       b) True. Since Kc is close to 1, both the reactantand product have to be present in significant proportions, to keeptheir       ratio balanced    c) False. Since Kc is so low, therefore, thereaction will proceed to a very low extent, and there is a verysmall change    in the concentration of reactants       d) False. A caltalyst can change only the time required inattaining equilibrium, but will cause the same equilibrium       concentrations as those without catalyst.

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