The recommended adult dose of Elixophyllin ,a drug used to treat asthma,is 105 mg kg^-1 of body mass.Calculate the dose in milligrams for a 105-lb person.(1 lb = 453.59 g)

Question

Quizplus · Accepted Answer

1. Convert 105 lbs to grams: 105 lbs × 453.59 g/lb = 47,622.45 g
2. Multiply the body mass in grams by the recommended dose per kg: 47,622.45 g × (105 mg/kg) = 4,999,175.25 mg
3. Round to the nearest milligram: 4,999,175 mg ≈ 4,999,000 mg ≈ 5,000,000 mg (to 1 significant figure)
4. Convert the answer to scientific notation: 5,000,000 mg = 5 × 10^6 mg
5. Divide by 10^3 to convert to milligrams: 5 × 10^6 mg ÷ 10^3 = 5 × 10^3 mg
6. Round to the nearest whole number: 5 × 10^3 mg ≈ 5000 mg
Therefore, the dose in milligrams for a 105-lb person is approximately 286 mg (option D).

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