Answer :
Final answer:
To find the number of atoms in a sample of caesium, first convert the mass to moles. Then, use Avogadro's number to convert moles to atoms. The number of atoms in the sample is 6.4 x 10^23.
Explanation:
To find the number of atoms in a sample of caesium, we need to use the concept of moles and Avogadro's number. First, we find the molar mass of caesium which is 132.91 g/mol. Then, we convert the given mass of the sample to moles by dividing it by the molar mass. Next, we use Avogadro's number, which is 6.022 x 10^23 atoms/mol, to convert the moles of caesium to atoms. Multiply the number of moles by Avogadro's number to get the number of atoms in the sample. In this case, the number of atoms in the 1.69 x 10^3 g sample of caesium is approximately 6.4 x 10^23 atoms.
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