Abottle of the pain reliever ibuprofen (c13h18o2, molar mass 206.3 g/mol) has 485 tablets. each tablet contains 200. mg of ibuprofen. (a) how many moles of ibuprofen does the bottle contain? (b) how many molecules of ibuprofen does the bottle contain?):

(a) 485 x 200 mg = 97000 mg of ibuprofen in the bottle

97000 mg x (1g/1000mg) = 97g of ibuprofen in the bottle

97g (1 mol/ 206.5gC13H18O2) = 0.46973 moles of ibuprofen in the bottle

(b) 0.46973 mol C13H18O2 (6.022 x 10^23 molecules/1mol) = 2.8287 x 10^23 molecules of ibuprofen in the bottle