QuestionMay 13, 2025

Calculate the number of atoms in a 4.97times 10^-20 mol sample of strontium. Round your answer to the hundreds place.

Calculate the number of atoms in a 4.97times 10^-20 mol sample of strontium. Round your answer to the hundreds place.
Calculate the number of atoms in a 4.97times 10^-20 mol sample of strontium. Round your answer to the hundreds place.

Solution
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Answer

29,930 atoms Explanation 1. Use Avogadro's Number The number of atoms in a mole is given by **Avogadro's number**, which is 6.022 \times 10^{23} atoms/mol. 2. Calculate the Number of Atoms Multiply the number of moles by Avogadro's number: \[ 4.97 \times 10^{-20} \, \text{mol} \times 6.022 \times 10^{23} \, \text{atoms/mol} \] 3. Perform the Calculation Calculate the product: \[ = 2.993 \times 10^4 \, \text{atoms} \]

Explanation

1. Use Avogadro's Number<br /> The number of atoms in a mole is given by **Avogadro's number**, which is $6.022 \times 10^{23}$ atoms/mol.<br /><br />2. Calculate the Number of Atoms<br /> Multiply the number of moles by Avogadro's number: <br />\[ <br />4.97 \times 10^{-20} \, \text{mol} \times 6.022 \times 10^{23} \, \text{atoms/mol} <br />\]<br /><br />3. Perform the Calculation<br /> Calculate the product:<br />\[ <br />= 2.993 \times 10^4 \, \text{atoms} <br />\]
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