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1a ) The reaction 2 A → B + C is first order in A. A...

1a ) The reaction 2 A → B + C is first order in A. A time lapse of 180 s was required for the concentration of A to drop from an initial value of 1.5 x 10-2 M to 2.5 x 10-3 M. How much additional time, in s, is required for [A] to decrease further to 1.0 x 10-4 M?

  • A.

    500

  • B.

    320

  • C. 750

  • D.

    360

  • E.

    180

1b) For a reaction that proceeds by the following two-step mechanism

A2 ⇄ 2A (fast)

A + B → C (slow)

Which of the following statements is/are correct?

1)   The reaction is first order in the concentration of A2.

2)   B is a reaction intermediate.

3)   The rate-determining step is bimolecular.

4)   The units of the specific rate constant are mol1/2L-1/2s-1

  • A.

    2 only

  • B.

    2 & 3 only

  • C.

    1 & 4 only

  • D.

    3 only

  • E.

    1 & 3 only

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