An average cup of coffee contains about 125 mg of caffeine, #C_8H_10N_4O_2#. How many moles of caffeine are in a cup, and how many molecules of caffeine?
Enough caffeine to keep you up at night?
The molecular mass of caffeine is
Moles of caffeine in a cup
The above calculation gives an answer in moles. This is simply a number, i.e.