Calling all chemistry geniuses... help please??? Thank you!
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Calling all chemistry geniuses... help please??? Thank you!

[From: ] [author: ] [Date: 13-01-29] [Hit: ]
The doctor order you to add 1.0 grams of morphine to 250 mL of an IV solution and deliver it to the patient at 4.0mg/min. In this particular IV, 20. drops is equal to 1.......
Intravenous morphine therapy is started for a patient. The doctor order you to add 1.0 grams of morphine to 250 mL of an IV solution and deliver it to the patient at 4.0mg/min. In this particular IV, 20. drops is equal to 1.0 mL. What is the flow rate in drops per minute?

Thanks!

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(1).. use dimensional analysis
(2).. start with the thing you want to convert FROM on the left and convert to the right
(3).. arrange the "unit factors" so that the units cancel out appropriately.
(4).. setup the conversion first, then run the calcs

the conversion...
(4.0mg / min) x (1g / 1000mg) x (250mL / 1.0g) x (20. drops / 1.0mL) = 20. drops / min

the calcs'
4.0 / 1000 x 250 x 20 =

*******
notice how I started with 4.0mg / min? that is the "from" in the problem statement

notice how the units cancel

..mg... ..g... .. . mL... drops.... ....drops
------ x ------ x ------ x ------- ==> --------
.min.. ..mg...... g..... ...mL ...... ....min

notice how..
.. mg / mg
.. g / g
.. mL / mL
all cancel out leaving
.. drops / min

*********
questions?
1
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