A tablet of Benadryl (R), an antihistamine, has a mass of 0.49 g. It contains 25...

A tablet of Benadryl (R), an antihistamine, has a mass of 0.49 g. It contains 25 mg of the active ingredient, diphenhydramine HCL. What percent of the tablet is active ingredient?

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Expert Solution

Mass of a tablet of Benadryl (R) = 0.49 g (given)

Mass of a tablet of Benadryl (R) in mg = 0.49 x 1000 = 490 mg.

Mass of the active ingredient, diphenhydramine HCL in a tablet of Benadryl (R) = 25 mg (given)

Percent of the active ingredient = (Mass of the active ingredient/ Mass of a tablet of Benadryl) x 100

= (25 mg/490mg) x 100 = 5.10 %

5.10 % of the tablet is active ingredient.

queen_honey_blossom answered 2 years ago

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