In order to plate a steel part having a surface area of 200 inch square with a 0.005 in.-thick layer of nickel: how many atoms of nickel are required

The surface area is given and thickness is 0.005 inch thus, volume will be:

Converting to

The density of Nickel is thus, mass will be:

Now, molar mass of nickel is 58.7 g/mol thus, number of moles can be calculated as follows:

in 1 mole there are thus, number of atoms in 2.48 mol will be:

Therefore, number of atoms of nickel required is

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

the answer would be a