The mass of a single molybdenum atom is 1.59*10⁻²² g. Suppose enough Mo atoms were lined up like beads on a string to span a distance of 33.4 cm (13 inches). How many atoms would be required?

7.99 * 10⁸ atoms

Explanation:

The diameter of Molybdenum atom is 418pm = 0.000000000418m

therefore to determine number of Mo Atoms that'll be required =

0.334 : 0.000000000418 = 7.99 * 10⁸ atoms

Mass of one Mo atom = 1.59*10⁻²² g

Mass of 7.99 * 10⁸ atoms that'll be required = 1.59*10⁻²² * 7.99 * 10⁸ =

12.7041 * 10⁻¹³g.