Would someone be so kind to check an answer section

Hi Guys

I've attached a question sheet just because it has a table and makes it easier for you kind people to read l've also attached the answers l've got but l think they are wrong reaction rates are not my strong points or Chemistry on the whole. Would some kind person have a look and let me know where l am going wrong?

Many Thanks in advance

You've got the rate constant wrong as you have plugged the wrong values into the rate equation.

You just choose any experiment run and put the values in with k=rate/[propanone][H+]

Because of this you have the value of the rate in expt 5 wrong...