. How many grams of dextrose are needed

Question

a pharmacy tech must prepare 250 mL 0f 2.5% dextrose solution

Answer 1

Assuming that is 2.5% (w/v) then that is 2.5 grams dextrose per 100 mls of solution.  Since you want 250 mls of solution, you need:

2.5 g/100 ml x 250 ml = 6.25 grams of dextrose required.