How many molecules of aspirin (formula mass aspirin = 180.0 amu)are there in a 0.250-gram sample? A)6.02 × 10²³ B)8.36 × 10²⁰ C)1.51× 10²³ D)More information is needed.

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Quizplus · Accepted Answer

To find the number of molecules, first convert grams to moles using the formula mass: 0.250 g / 180.0 g/mol = 0.00139 mol. Then, multiply by Avogadro's number (6.02 × 10^23 molecules/mol) to find the number of molecules: 0.00139 mol × 6.02 × 10^23 molecules/mol ≈ 8.36 × 10^20 molecules.

How Many Molecules of Aspirin (Formula Mass Aspirin = 180