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

**How many molecules are there in 1 mole of water?**

1 mol H_{2}O = 6.02 x 10^{23} H_{2}O molecules

*1 mole of water contains 6.02 x 10^{23} water molecules.

**How many molecules are there in 2 moles of water?**

2 mol H_{2}O = 2 x 6.02 x 10^{23 }= 1.204 x 10^{24} H_{2}O molecules

*2 moles of water contains 1.204 x 10^{24} water molecules.

** **

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

2 mol H_{2}O = 2 x 6.02 x 10^{23 }= 1.204 x 10^{24} H_{2}O molecules

2 mol H_{2}O = 3(2 x 6.02 x 10^{23})= 3(1.204 x 10^{24}) = 3.612 x 10^{24} atoms

*2 moles of water contains 3.612 x 10^{24} atoms (combination of hydrogen & oxygen atoms).

** **

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

2 mol H_{2}O = 2 x 6.02 x 10^{23 }= 1.204 x 10^{24} H_{2}O molecules

2 mol H_{2}O = 2(2 x 6.02 x 10^{23})= 2(1.204 x 10^{24}) = 2.408 x 10^{24} hydrogen atoms

*2 moles of water contains 2.408 x 10^{24} hydrogen atoms.

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

2 mol H_{2}O = 2 x 6.02 x 10^{23 }= 1.204 x 10^{24} H_{2}O molecules

2 mol H_{2}O = 1(2 x 6.02 x 10^{23})= 1(1.204 x 10^{24}) = 1.204 x 10^{24} oxygen atoms

*2 moles of water contains 1.204 x 10^{24} oxygen atoms.

*Note: 2 moles of water contains 2.408 x 10 ^{24} hydrogen atoms & 1.204 x 10^{24} oxygen atoms. Therefore, the total number of atoms in 2 moles of water is 3.612 x 10^{24} atoms.*

*(2.408 x 10 ^{24}) + (1.204 x 10^{24}) = 3.612 x 10^{24} atoms*