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JAMB Chemistry 1998 Question 30

Question 30

Rates of Reaction

2X(g) + Y(g) → Z(g). In the equation above, the rate of formation of Z is found to be independent of the concentration of Y and to quadruple when the concentration of X is doubled. The correct equation for the reaction is

  1. A.R = k [X][Y]
  2. B.R = k[X]2[Y]
  3. C.R = k[X]0[Y]2
  4. D.R = k[X]2[Y]0
Show the answer and explanation

Answer: D (R = k[X]2[Y]0)

Explanation

Doubling [X] makes the rate 4 = 22 times faster, so the order in X is 2. The rate does not depend on Y, so its power is 0.