# Number of Moles & Number of Particles (calculation 2)

Use this formula: How many molecules are there in 1 mole of water?

1 mol H2O = 6.02 x 1023 H2O molecules

*1 mole of water contains 6.02 x 1023 water molecules.

How many molecules are there in 2 moles of water?

2 mol H2O = 2 x 6.02 x 1023 = 1.204 x 1024 H2O molecules

*2 moles of water contains 1.204 x 1024 water molecules.

How many atoms are there in 2 moles of water?

2 mol H2O = 2 x 6.02 x 1023 = 1.204 x 1024 H2O molecules

2 mol H2O = 3(2 x 6.02 x 1023)= 3(1.204 x 1024) = 3.612 x 1024 atoms

*2 moles of water contains 3.612 x 1024 atoms (combination of hydrogen & oxygen atoms).

How many hydrogen atoms are there in 2 moles of water?

2 mol H2O = 2 x 6.02 x 1023 = 1.204 x 1024 H2O molecules

2 mol H2O = 2(2 x 6.02 x 1023)= 2(1.204 x 1024) = 2.408 x 1024 hydrogen atoms

*2 moles of water contains 2.408 x 1024 hydrogen atoms.

How many oxygen atoms are there in 2 moles of water?

2 mol H2O = 2 x 6.02 x 1023 = 1.204 x 1024 H2O molecules

2 mol H2O = 1(2 x 6.02 x 1023)= 1(1.204 x 1024) = 1.204 x 1024 oxygen atoms

*2 moles of water contains 1.204 x 1024 oxygen atoms.

Note: 2 moles of water contains 2.408 x 1024 hydrogen atoms & 1.204 x 1024 oxygen atoms. Therefore, the total number of atoms in 2 moles of water is 3.612 x 1024 atoms.

(2.408 x 1024) + (1.204 x 1024) = 3.612 x 1024 atoms