Find the number of ibuprofen molecules in a tablet containing 200.0 mg of ibuprofen (c13h18o2).

Asked by maham237 @ 25/12/2020 in Chemistry viewed by 320 People

Find the number of ibuprofen molecules in a tablet containing 200.0 mg of ibuprofen (c13h18o2). express the amount to four significant figures.

Answered by maham237 @ 25/12/2020

First let us calculate for the molar mass of ibuprofen:

Molar mass = 13 * 12 g/mol + 18 * 1 g/mol + 2 * 16 g/mol

Molar mass = 206 g/mol = 206 mg / mmol

Calculating for the number of moles:

moles = 200 mg / (206 mg / mmol)

moles = 0.971 mmol = 9.71 x 10^-4 moles

Using the Avogadros number, we calculate the number of
molecules of ibuprofen:

Molecules = 9.71 x 10^-4 moles * (6.022 x 10^23 molecules
/ moles)

Molecules = 5.85 x 10^20 molecules

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