How many Cs atoms are there in a 53.7 gram sample of Cs?

Answer 1

This is a two-step calculation. First convert grams Cs to moles Cs. Then convert moles Cs to atoms Cs.

The atomic weight of cesium is 133 g/mol

1. To convert grams to moles:

moles Cs= 53.7 g Cs1 mol = 0.404 mol Cs133 g

Multiply by moles per gram. Grams cancel out.

2. To convert moles to atoms:

atoms Cs = 0.404 mol Cs6.02 x 1023 atoms = 2.43E+23 atoms Csmol

Multiply by atoms/mole. Moles cancel out.

Answer 2

To find the number of Cs atoms, you need to first convert the mass of Cs into moles using the molar mass of Cs. The molar mass of Cs is approximately 132.91 g/mol. Then, using Avogadro's number (6.022 x 10^23 atoms/mol), you can calculate the number of Cs atoms in the sample.