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

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.