Some measurements of the initial rate of a certain reaction are given in the tab

Question

Some measurements of the initial rate of a certain reaction are given in the table below.

N2

H2

2.49M

0.760M

91.0/Ms

1.15M

0.760M

19.4/Ms

2.49M

3.02M

362./Ms

Use this information to write a rate law for this reaction, and calculate the value of the rate constant k

Round your value for the rate constant to 2 significant digits. Also be sure your answer has the correct unit symbol.

rate = k__________?

k = ___________?

N2

H2

2.49M

0.760M

91.0/Ms

1.15M

0.760M

19.4/Ms

2.49M

3.02M

362./Ms

Explanation / Answer

from the date reaction is second order with respect to N2

reaction is first with respect to H2

overall order = 2 +1 = 3

so rate expression as follows

rate = K [N22] [H2]

now by using values in table calculate K

K = rate / [N22][H2]

K = 91.0 /[2.49]2[0.76]

K = 91.0 / 4.712

K = 19.3 mol-1 Ls-1

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