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 (show your work).
• calculate the number of moles of acetaminophen in a single tablet (show your work).
• calculate the number of moles of acetaminophen that an adult would have taken if she took three doses of acetaminophen in one day (show your work).

1) Molar mass C8H9NO2

Element    Atomic mass    # of atoms   mass
                       g/mol                                  g
C               12                         8               12*8 = 96
H                 1                         9                1*9 =    9
N               14                         1               14*1 = 14
O               16                        2                16*2 = 32

                              molar mass =   96 + 9 + 14 + 32 = 151 g/mol

2) Number of mols in a tablet

# of moles = mass / molar mass = 0.500 g / 151 g/mol = 0.003311 moles

3) 3 doses * 2 tablets * 0.003311 moles / tablet = 0.020 moles