1) Find out the molar mass of strontium (Sr)
The molar mass of strontium is 87.62 g/mol.
2) Convert grams into moles.
[tex]\text{mol of Sr=9.52}\cdot10^3g\cdot\frac{1\text{ mol Sr}}{87.62\text{ g Sr}}=108.65\text{ mol Sr}[/tex]3) Convert moles into atoms.
[tex]\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}[/tex]