What is the mass of 4.85 X 10^22 atoms of iron (Fe) ?

Mass = 4.5 g

Explanation:

Given dа ta:

Number of atoms of iron = 4.85 * 10²² atoms

Mass of iron = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms, ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 * 10²³ is called Avogadro number.

For example,

4.85 * 10²² atoms of iron / 6.022 * 10²³ atoms * 1 mol

0.081 mol

Mass of iron:

Mass = number of moles * molar mass

Mass = 0.081 mol * 55.85 g/mol

Mass = 4.5 g