contestada

If a sample of pure sodium has a mass of 8.2 grams and sodium has an average atomic mass of 22.99 g/mol, how many sodium atoms are there in the sample?

Respuesta :

AnnaMarie714
8.2 grams X (1 mol/23 grams) X 6.02 X 10^23 atoms/mole = 2.15 X 10^23 atoms

Answer:

There are [tex]2.148\times 10^{23} atoms[/tex] of sodium.

Explanation:

Mass of sodium = 8.2 g

Molar mass of sodium = 22.99 g/mol

Moles of sodium = [tex]\frac{8.2 g}{22.99 g/mol}=0.3567 mol[/tex]

1 mole = [tex]N_A=6.022\times 10^{23} atoms[/tex]

Number of sodium atoms in 0.3567 moles = N

[tex]N=0.3567\times 6.022\times 10^{23} atoms=2.148\times 10^{23} atoms[/tex]