The specific activity of your sample will be
First, the enzyme reaction mixture's activity is a measure of how many moles of substrate are converted per unit of time. In your case, the enzyme mixture converts 0.0252
Specific activty, on the other hand, is defined as the activity of an enzyme per mg of total protein.
Plug your values into the eqaution above to solve for the sample's specific activity
Now, since you give the answer in nmol per mg per minute, set up a simple conversion factor to get you from micromol to nanomol
If you round this off to two sig figs, the number of sig figs in 0.085 mg, the answer will be