A 9.87-mol sample of Zr represents how many atoms?

A mole of any element is equal to avogadro's number which is equivalent to 6.0221409e+23, that is 6.0221409e+23 molecules or atoms per mole. In this case, we are given with 9.87 sample which when multiplied to Avogadro's number is equal to 5.943853e+24 atoms.