Question

15g of potassium chloride is diluted in is diluted in 2 L of sterile water for injection.What is the final strength (w/v)?

Answer 1

What units do you want it.

15 g/2L is one way and it is w/v. More than likely you want g/100 mL.
So 15g/2L is 7.5g/1 L = 0.75g/100 mL