Consider the following reaction.  

 3 A + B + 4 C $\displaystyle \to$  3 D + E

The following data was collected on the reaction.

Trial	[A]0	[B]0	[C]0	Rate (M/s)
1	0.57	0.59	0.57	4.344
2	1.14	0.59	0.57	4.344
3	0.57	1.18	0.57	8.688
4	0.57	0.59	1.14	8.688

Two mechanisms are proposed:  

Mechanism 1:

A  + B	$\displaystyle \to$	D + Y
Y + C	$\displaystyle \to$	X
X + A + C	$\displaystyle \to$	D + Z
Z + A	$\displaystyle \to$	E

Mechanism 2:

A  +  C	$\displaystyle \to$	D + Y
Y + B + C	$\displaystyle \to$	X + D
X + A + C	$\displaystyle \to$	E

Which mechanism best fits the data?  Select an answer Mechanism 1 Mechanism 2

Which is most likely the rate-determining step? Select an answer Step 1 Step 2 Step 3 Step 4