3% solution in a 1.7 mL cartridge yields approximately how many mg?

3% solution in a 1.7 mL cartridge yields approximately how many mg?

• A. 51 mg
• B. 54 mg
• C. 81 mg
• D. 102 mg

Answer: (A)

Understanding how percent strength translates to milligrams per cartridge helps you estimate dose quickly. A 3% solution means 3 g of drug in 100 mL, which equals 30 mg per 1 mL. A 1.7 mL cartridge therefore contains 30 mg/mL times 1.7 mL, where 30 × 1.7 equals 51 mg. So the cartridge holds about 51 mg. The other options would require a larger volume (for example, 1.8 mL would give 54 mg) or a different concentration.

Understanding how percent strength translates to milligrams per cartridge helps you estimate dose quickly. A 3% solution means 3 g of drug in 100 mL, which equals 30 mg per 1 mL. A 1.7 mL cartridge therefore contains 30 mg/mL times 1.7 mL, where 30 × 1.7 equals 51 mg. So the cartridge holds about 51 mg. The other options would require a larger volume (for example, 1.8 mL would give 54 mg) or a different concentration.