1) Suppose a reaction involve two species, and is first order in the first speci

Question

1) Suppose a reaction involve two species, and is first order in the first species and second order in the second species. In the rate equation, what are the units of the rate constant, k?

A) M-3s-1

B) M-1s-1

C) M-2s-1

D) M-4s-1

E) s-1

2) Consider this balanced chemical equation:

H2O2(aq)+3I-(aq)+2H+(aq) ? I3-(aq)+2H2O(l)

In the first 10.0 seconds of the reaction, the concentration of I- drops from 1.000 M to 0.900 M. Determine the rate of change in the concentration of H+ during this time interval. Express your answer in M/s. Enter only a numerical value, do not enter units.

Explanation / Answer

1.      dc/dt = k [X][Y]2

Dimensional analysis

<k> = <dc/dt> / (<[X]><Y2>) = M.s-1 /(M x M2) = M-2s-1

Answer C.

2.

H2O2(aq)+    3I-(aq)        +    2H+(aq) ? I3-(aq)+2H2O(l)
                    -0.1 mol       -0.1 mol x 2/3       concentration change in the first 10 s

dc/dt = (0.900

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