To calculate the number of atoms of Nickel in 30.0 grams of Nickel, we need to use the molar mass of Nickel and Avogadro's number.
The molar mass of Nickel is 58.69 g/mol, which means that one mole of Nickel atoms weighs 58.69 grams.
To find the number of moles of Nickel in 30.0 grams of Nickel, we divide the mass by the molar mass:
30.0 g / 58.69 g/mol = 0.511 moles
Finally, we can use Avogadro's number, which is 6.022 x 10^23 atoms/mol, to find the number of atoms of Nickel:
0.511 moles x 6.022 x 10^23 atoms/mol = 3.08 x 10^23 atoms
So there are approximately 3.08 x 10^23 atoms of Nickel in 30.0 grams of Nickel.