Question

Ibuprofen (C13H18O2) is the active ingredient in many nonprescription pain relievers. Each tablet contains 200 mg of ibuprofen, and a typical adult dose is two tablets every six hours.
· Determine the molar mass of ibuprofen (show your work).
· Calculate the number of moles of ibuprofen in a single tablet (show your work).
· Calculate the number of moles of ibuprofen that an adult would have taken if she took four doses of ibuprofen in one day (show your work).

Answer 1

1. For molar mass of ibuprofen, look at the formula and add up the molar masses of all the elements contained in the compound. So starting with C13, the molar mass of carbon is 12.011 g/mol and there are 13 carbon atoms per molecule, so you’d multiply 12.011 * 13.

Repeat for the other elements.

Add up the masses to get the total molar mass.

Answer 2

2. Number of moles per 200mg tablet. 200mg = 200/100 or 0.200 grams.

From there, divide 0.200grams by the molar mass from step 1 to get moles per tablet.

3. Four doses per day, two tablets per dose, means that 8 tablets were taken total. So simply multiply the moles from part 2, times 8, to get the total moles.

Answer 3

thank you so much