A 1.8 mL cartridge of 2% lidocaine contains how many milligrams of lidocaine?

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Multiple Choice

A 1.8 mL cartridge of 2% lidocaine contains how many milligrams of lidocaine?

Explanation:
Understanding percent concentration lets you convert to mg per milliliter and then find the total in the cartridge. A 2% lidocaine solution has 2 g per 100 mL, which is 20 mg per 1 mL. For a 1.8 mL cartridge, the total lidocaine is 1.8 × 20 mg = 36 mg. So the cartridge contains 36 milligrams of lidocaine.

Understanding percent concentration lets you convert to mg per milliliter and then find the total in the cartridge. A 2% lidocaine solution has 2 g per 100 mL, which is 20 mg per 1 mL. For a 1.8 mL cartridge, the total lidocaine is 1.8 × 20 mg = 36 mg. So the cartridge contains 36 milligrams of lidocaine.

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