An English unit used in pharmaceutical work is the grain (gr). There are 15 grains in 1 gram. An aspirin tablet contains 5.0 gr of aspirin. A 145 lb person takes two aspirin tablets. Calculate the dosage of aspirin, which is the number of milligrams of aspirin per kilogram of body weight. (1 lb = 453.5 g)

10.2 mg/kg

Explanation:

An aspirin tablet contains 5.0 gr of aspirin. Two aspirin tablets contain 2 × 5.0 gr = 10 gr. The mass of aspirin, in grams, is:

10 gr × (1 g/15 gr) = 0.67 g = 670 mg

The person has a body weight of 145 lb. The mass of the person, in kilograms, is:

145 lb × (0.4535 kg/1 lb) = 65.8 kg

The dosage of aspirin is:

670 mg/65.8 kg = 10.2 mg/kg

the grams   of   barium that   are in   2.3 x 10^23   atoms of barium   is   52.4 g (answer c)

    calculation

mass = moles   of ba   x molar   mass of ba

  molar mass of ba from periodic table=   137.3 g/mol

  use the   avogadro's law   constant   to   calculate the moles of barium

  that   is     1 mole =   6.02   x 10^23 atoms

                    ? moles = 2.3 x 10^23   atoms

by cross   multiplication

=(1 mole   x 2.3x 10^23 atoms)   / 6.02   x10^23 atoms)=   0.382   moles

mass   is therefore = 137.3   g/mol x 0.382 mol = 52.4 ( answer c)

explanation:

c8h10 is your answerr