Paper thickness varies. Typically, 100 sheets are about a cm thick. Atoms typically vary from 1 to 3 angstroms in radius. (An angstrom is 10-10 m.) Suppose a piece of paper is 0.0072 cm thick. How many atoms span the thickness if the radius of the atom is 1.23 angstroms

Explanation:

Thickness of a piece of paper = 0.0072 cm

Radius of an atom =

Conversion factor of to is

Diameter of an atom =

Number of atoms in one piece of paper is

Hence, the number of atoms in one piece of paper is .

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)