Question

A reaction between substances A and B has been found to give the following data:

3A + 2B --> 2C + D

[A] (mol/L)
[B] (mol/L)
Rate of appearance of C (mol/L-hr)
1.0 x 10^-2
1.0
0.3 x 10^-6
1.0 x 10^-2
3.0
8.1 x 10^-6
2.0 x 10^-2
3.0
3.24 x 10^-5
2.0 x 10^-2
1.0
1.20 x 10^-6
3.0 x 10^-2
3.0
7.30 x 10^-5

Answer 1

3


5

1

4

3

Answer 2

A reaction between the substances A and B has been found to give the following data:

3A + 2B -----> 2C + D


[A]
(mol/L)
1.0 X 10?²
1.0 X 10?²
2.0 X 10?²
2.0 X 10?²
3.0 X 10?²


[B]
(mol/L)
1.0
3.0
3.0
1.0
3.0


Rate of Appearance of C
(mol/L-hr)
0.3 X 10^-6
8.1 X 10^-6
3.24 X 10^-5
1.20 X 10^-6
7.30 X 10^5

Using the data above, determine the order of the reaction with respect to A and B and the rate law and calculate the specific rate constant.

18

Answer 3

if [B] is trippled C increases by 81=3⁴ fold[1 &2 data]
so C depends on [B]⁴

if [A] doubled then C increases by 3.24*10^5/8.1*10^6= 4 = 2² times [2 &3 data ]

so C depends on [A]²

ie C = k[A]²[B]⁴