Question

How many atoms are in a sample of 7.50 g of Potassium (K)?

Answer 1

`=1.134xx10^23` atoms

Explanation:

`n(K)=7.4/39.098`

`n(K)=0.1883 mol`

number of atoms in 1 mole = `6.023xx10^23`

`:.` number of potassium atoms in 7.5g = `0.1883xx6.023xx10^23`
`=1.134xx10^23` atoms