Question

7. What is the reaction order for each reactant and the rate coefficient for the following reaction? A+B+C ->Z [A] (mol L B (mol L[C] (mol L ](mol L sec1) 0.010 0.020 0.010 0.020 0.0100 0.0100 0.0200 0.0100 0.10 0.10 0.10 0.20 3.0 x 10-2 3.0 x 102 1.2 x 10-1 1.5 x 10-2

Answer 1

7)

a)

see experiment 1 and 2:

[A] doubles

[B] is constant

[C] is constant

rate is constant

so, order of A is 0

see experiment 1 and 3:

[A] is constant

[B] doubles

[C] is constant

rate becomes 4 times

so, order of B is 2

see experiment 2 and 4:

[A] is constant

[B] is constant

[C] doubles

rate becomes 0.5 times

so, order of C is -1

b)

rate law is:

rate = k[B]^2[C]^-1

put values from row 1

3.0*10^-2 M/s = k (0.01 M)^2*(0.10 M)^-1

k = 0.3 s-1

Answer: 0.3 s-1