A doctor orders 4.5 mL of phenobarbital elixir. If the phenobarbital elixir is available as 20. mg per 7.5 mL, how many milligrams is given to the patient?

Question

Chemistry

Piper Castro

15 March, 22:22

A doctor orders 4.5 mL of phenobarbital elixir. If the phenobarbital elixir is available as 20. mg per 7.5 mL, how many milligrams is given to the patient?

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Maxim Bolton · Answer 1

In order to find how many milligrams is given to the patient we need to determine the rate by dividing what is available then multiply by the amount that was ordered.

Step 1: (20.0mg / 7.5mL) = 2.66667 mg/mL

Step 2: (2.66667mg/mL x 4.5mL) = 12mg

*Note that mL unit cancels out so we are left with mg

Answer: 12.0 mg of phenobarbital elixir