1. Find the molar mass of cesium (Cs):
* The molar mass of cesium is 132.91 g/mol (you can find this on the periodic table).
2. Calculate the number of moles of cesium:
* Moles = mass / molar mass
* Moles = 0.575 g / 132.91 g/mol
* Moles ≈ 0.00432 mol
3. Use Avogadro's number to find the number of atoms:
* Avogadro's number is 6.022 x 10^23 atoms/mol
* Number of atoms = moles x Avogadro's number
* Number of atoms ≈ 0.00432 mol x 6.022 x 10^23 atoms/mol
* Number of atoms ≈ 2.60 x 10^21 atoms
Therefore, there are approximately 2.60 x 10^21 atoms in 0.575 grams of cesium.
