Question

Calculate the number of atoms in a 9.52×103 g sample of strontium.

Answer 1

1) Find out the molar mass of strontium (Sr)

The molar mass of strontium is 87.62 g/mol.

2) Convert grams into moles.

`\text{mol of Sr=9.52}\cdot10^3g\cdot\frac{1\text{ mol Sr}}{87.62\text{ g Sr}}=108.65\text{ mol Sr}`

3) Convert moles into atoms.

`\text{Atoms of Sr=108.65 mol Sr}\cdot\frac{6.02\cdot10^(23)atoms\text{ of Sr}}{1\text{ mol Sr}}=6.54\cdot10^(25)atoms\text{ of Sr}`