Question

Hi! I need a little help with this problem, maybe not the whole thing... but just getting started. Thank you! :)

1. Acetaminophen (C8H9NO2) is the active ingredient in many nonprescription pain relievers. Each tablet contains 500 mg of acetaminophen, and a typical adult dose is two tablets every eight hours.

• Determine the molar mass of acetaminophen.
• Calculate the number of moles of acetaminophen in a single tablet.
• Calculate the number of moles of acetaminophen that an adult would have taken if she took three doses of acetaminophen in one day.

Answer 1

The molar mass:
Element = how much there is x molceular mass (look in the periodic table)
For example H2O
H-2x1.01
O-1x16
Then you add them together so for water it's 18.02

In a single tablet you know it contains 500mg change mg to g
Then you take that value and divide it by the molar mass
And that would give you the number of moles

A adult takes 3 doses a day so times 3 x 500mg and convert that to grams
So now take that value and divide it by molar mass

* g x mol/g = moles so we divide

Does it make sense?

Answer 2

Yes, thank you! I actually did a bit more studying and it made sense. This is helpful for anyone else though, who may need it in the future! :)