Determine the number of atoms in a sample of nickel that has a mass of 8.30 × 10−12 g

There are 8.4 × 10¹⁰ atoms in the given sample of Nickel.

Explanation:

To find the number of atoms in the given mass of Nickel, first we have to find the number of moles using its mass and molar mass of nickel then multiply the moles by the Avogadro's number so that we will get the number of atoms in that sample of nickel.

Moles of Nickel =  

                   =

                  = 1.4 × 10⁻¹³ moles

Now we have to multiply the number of moles by Avogadro's number, we will get the number of atoms of Nickel.

Number of atoms = 1.4 × 10⁻¹³× 6.022 × 10²³

                             = 8.4 × 10¹⁰ atoms of Nickel

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)