Consider the following reaction.  

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

The following data was collected on the reaction.

Trial	[A]0	[B]0	[C]0	Rate (M/s)
1	0.52	0.52	0.52	5.394
2	1.04	0.52	0.52	10.788
3	0.52	1.04	0.52	10.788
4	0.52	0.52	1.04	5.394

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