Which sample contains the greatest number of atoms. A sample of P that contains 2.82×1024 atoms or a 5.64 mole sample of Si?

Answer 1

Let's find the number of atoms in 5.64 moles of Si.

5.64 moles x 6.022x10²³ atoms / mole = 3.40x10²⁴ atoms of Si

Compare this to 2.82x10²⁴ atoms of P.

Clearly, the sample of Si has more atoms.

Answer 2

5.64 moles contains 5.64 moles x 6.022 x 10^23 atoms/mole = 3.40 x 10^24 atoms of Si. There are 6.022 x 10^23 atoms in one mole of an element or compound (Avogadro's number).

The are more atoms in the Si.