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Answer :
Final answer:
To find out the quantity of atoms in a 67.5 mg sample of strontium, convert the mass from milligrams to grams, convert it from grams to moles using the molar mass, then convert from moles to atoms using Avogadro's number.
Explanation:
The number of atoms in a given sample can be determined using Avogadro's number (6.022 x 10^23 atoms/mol). First, you need to convert milligrams to grams because the molar mass of Sr is expressed in grams/mol. Therefore, 67.5 mg is equivalent to 0.0675 g. Then, divide the mass of the sample by the molar mass of Sr to get the number of moles: 0.0675 g ÷ 87.62 g/mol = 7.70 x 10^-4 mol. To get the total number of atoms, multiply this by Avogadro's number: 7.70 x 10^-4 mol x 6.022 x 10^23 atoms/mol = 4.63 x 10^20 atoms. However, this value does not match any of the options you provided.
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