WHAT IS THE NUMBER OF ATOMS IN A 5.25 Mg sample of sodium /

Answer 1

To find the number of atoms in a sample of sodium, we first need to calculate the number of moles in the sample, using the formula:

Number of moles = Mass of sample / Molar mass of sodium

The molar mass of sodium is approximately 22.99 g/mol.

5.25 Mg is equal to 5.25 x 10^-3 g.

Number of moles = 5.25 x 10^-3 g / 22.99 g/mol = 0.228 moles

Now, we know that 1 mole of any substance contains approximately 6.022 x 10^23 atoms (Avogadro's number).

So, the number of atoms in a 5.25 Mg sample of sodium would be:

0.228 moles x 6.022 x 10^23 atoms/mole ≈ 1.37 x 10^23 atoms

Therefore, there are approximately 1.37 x 10^23 atoms in a 5.25 Mg sample of sodium.