The daily dose of ampicillin for the treatment of an ear infection is 115 mg/kg of body weight. what is the daily dose for a 43-lb child?

(43 lbs/1) x (1 kg/2.20 lbs) x ( 115 mg/ 1 kg) = 2.25 x 10^3 mg

h let me think

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.