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JAMB Chemistry 1991 Question 31

Question 31

Rates of Reaction

Initial concentration of NO in moles: 0.001, initial rate (moles / sec): 3.0 × 10−5
Initial concentration of NO in moles: 0.002, initial rate (moles / sec): 1.2 × 10−4
The data in the table above shows the rate of reaction of nitrogen (II) oxide with chlorine at 25°C. It can be concluded that doubling the initial concentration of NO increases the rate of reaction by a factor of

  1. A.two
  2. B.three
  3. C.four
  4. D.five
Show the answer and explanation

Answer: C (four)

Explanation

1.2 × 10−4 ÷ 3.0 × 10−5 = 4, so the rate becomes four times faster.