A patient is having an allergic reaction and takes a 12.5mg tablet of the over‑the‑counter antihistamine diphenhydramine hydrochloride, C17H22ClNO. How many molecules of diphenhydramine hydrochloride are in this tablet?

Agas has a volume of 0.7 l at 300 mmhg. what would be the new volume at 900 mmhg

Which statement correctly describes the phosphate ion, ? it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.

In the reaction h2co3 (aq) + 3nh3 (aq) = 2 nh4+ (aq) + co3 2-, how many electrons are transferred?