Question

Anyone can explain this question?

When the concentration of A is doubled, the rate for the reaction: 2 A + B-->2 C quadruples.
When the concentration of B is doubled the rate remains the same. Which mechanism below is
consistent with the experimental observations?
The answer is:
Step 1: 2A-->D (slow)
Step 2: B + D --> E (fast)
Step 3: E --> 2C (fast)

Answer 1

The answer is what?

Answer 2

Here
The answer is:
Step 1: 2A-->D (slow)
Step 2: B + D --> E (fast)
Step 3: E --> 2C (fast)

Answer 3

But I don't understand the theory for mechanism. If anyone can explain, that would be great.

Answer 4

Well, first step is rate determining step.

Answer 5

if thats not the formula you need the formula first