Final answer:
The concentration (% w/v) of a solution containing 15 g of drug in 500 mL is 3%.
Step-by-step explanation:
The concentration of a solution is typically expressed as a percentage which indicates the amount of solute present in a given amount of solution. For a percentage weight/volume (% w/v) concentration, we would calculate this by taking the mass of the drug (solute) and dividing it by the volume of the solution, then multiplying by 100 to convert it to a percentage.
In this case, with 15 g of drug in 500 mL of solution, the concentration is calculated as follows:
Concentration (% w/v) = (mass of solute in grams / volume of solution in mL) * 100
Concentration (% w/v) = (15 g / 500 mL) * 100
Concentration (% w/v) = 0.03 * 100
Concentration (% w/v) = 3%