chemistry help?

[匿名]

2016-07-12 12:08 pm

Acetylsalicylic acid (C9H8O4) is a medication, often used to relieve pain and reduce fever. It is more commonly called aspirin. Each tablet contains 325 mg of aspirin. An adult dose is 2 tablets.
• Calculate the molar mass of aspirin. Show all steps of your calculation.
• Calculate the number of moles of aspirin in a single tablet. Show all steps to find the answer.
• Calculate the number of moles of aspirin that an adult would have taken if she took four doses of aspirin in one day. Show all steps of your calculation.

回答 (1)

不用客氣

2016-07-12 4:58 pm

✔ 最佳答案

1.
Molar mass of C = 12.0 g/mol
Molar mass of H = 1.0 g/mol
Molar mass of O = 16.0 g/mol

Molar mass of C₉H₈O₄ = (12.0×9 + 1.0×8 + 16.0×4) g/mol = 180.0 g/mol

2.
No. of moles of aspirin in each tablet = (325/1000 g) / (180 g/mol) = 0.00181 mol

3.
No. of moles of aspirin taken in one day = [(325/1000 g) / (180 g/mol)] × 4 = 0.00722 mol

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