In our lab we reacted Mg+HCl and measured pressure as time progresses.

After graphing, and getting the initial rate I am left with as follows:

The [Mg] remained constant, we used a 2cm long strip of Mg, and it was not weighed.

[] is measured in mols/L

Initial Rate: [HCl] [Mg]

1.591 x10-1 0.5 -

4.795 x10-1 1 -

6.966 x10-1 1.5 -

1.32 2 -

Now we had to get the rate law using the above data

Rate = k[Mg]^m[HCl]^n

1.32/4.795E-1 = (2/1)^n

3 = 2^n n = log3/log2= 2

n = 2

I am stuck as to how do I get the value of M and K, as I am stuck

Also, I have to propose a rate mechanism (the thing with the elementary steps and what not)

I am totally stuck, and have no idea how to get the elementary steps.

Please help