Question

A chip in a microcomputer contain 5.72 x 10^-³ of silicon. Calculate the number of silicon atom in the ship (si=28; Avogadro constant = 6.02 × 10²³)

Answer 1

If the mass is 5.72 * 10^-3 grams, and the molar mass of silicon is 28, then the number of moles of silicon (5.72 * 10^-3)/28 = 2,04*10^-4. The Avogadro number shows the number of atoms in one mole. Then the number of atoms equals 2,04*10^-4 * 6,02 * 10²³ = 1,23*10²⁰.