60mg of dopamine in 12mL of solution administered at 3mL per hour. What is the flow rate of dopamine per hour

Question

60mg of dopamine in 12mL of solution administered at 3mL per hour. What is the flow rate of dopamine per hour

Answer 1

Flow rate is amount/time. = mg/hr

Things you know:

amount in solution: 60mg/12ml = 60 divided by 12 = 5 mg/ml

volume rate: 3ml/hr

Therefore:

5 mg/ml * 3ml/hr = 15 mg/hr (you can see how the ml in the top and bottom cancel our and you are left with mg/hr)

Answer 2

First, solve for amount of dopamine in one mL as follows:

60mg of dopamine dissolved 12mL solution is

60mg/12mL = 5mg/1mL

Since there are 3mL of this flowing per hour, then multiply times the above number times 3

(5mg/1mL)×(3mL/hour)=15mg/hour. <----this is the answer

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