Given the data below, find the value of k

Question

Given the data below for the reaction, 2 A + 2 B + 4 C => D + E + 3 F

Experiment	Initial conc of A, mol/L	Initial conc of B, mol/L	Initial conc of C, mol/L	Initial rate, mol/L.s
1	0.1	0.1	0.2	2 x 10-3
2	0.2	0.3	0.2	1.2 x 10-2
3	0.3	0.1	0.2	6 x 10-3
4	0.4	0.3	0.6	2.4 x 10-2

Calculate the value of k to 3 significant figures.

I know how to find the rate law for only two initial concentrations, how do I find the rate order of A when there are no similarities between B and C to cancel out and compare?

Can someone work out the entire problem for me? I don't know where I'm going wrong

Answer 1

Hi, if you look at reactions 1 and 3, the molar concentrations of B and C are held constant, and the molar concentration of A increases by a factor of 3. The rate also increases by a factor of 3. Thus A is first order.