Question

How many tablets each containing 250 mg of penicillin are needed to make 250 mL suspension containing 150 mg/mL?

1) 80
2) 100
3) 150
4) 200

Answer 1

To make a 250 mL suspension containing 150 mg/mL of penicillin, 150 tablets each containing 250 mg of penicillin are needed.

Step-by-step explanation:

To find out how many tablets are needed, we need to calculate the total amount of penicillin required and then divide it by the amount of penicillin per tablet. The total amount of penicillin needed is given by the concentration of the suspension multiplied by the volume of the suspension:

Total amount of penicillin = Concentration of suspension × Volume of suspension

= 150 mg/mL × 250 mL = 37,500 mg

Next, we divide the total amount of penicillin by the amount of penicillin per tablet:

Number of tablets needed = Total amount of penicillin ÷ Amount of penicillin per tablet

= 37,500 mg ÷ 250 mg = 150

Therefore, option 3) 150 tablets each containing 250 mg of penicillin are needed to make a 250 mL suspension containing 150 mg /mL.