1. Mole Calculations Part Three

2. Note, there are 2 O's for each CO2 molecule
Calculate the number of O atoms in 250. g of CO2.
250. g CO2
x 1 mole
x x 1023 molec
x 2 atoms O
= x1024 atoms O
44.0 g
1 mole
1 molec CO2 O C
Note, there are 2 O's for each CO2 molecule

3. Calculate the mass of CuSO4.6H2O that contains 6.93 x 1025 atoms of O.

4. There are 10 O atoms in one formula unit
Cu2+
Octahedron

5. Calculate the mass of CuSO4. 6H2O that contains 6.93 x 1025 atoms of O.
x 1 FU
x 1 mole
x g
= x 103 g
10 atoms O
6.02 x 1023 FU
1 mole

6. Calculate the mass of P2Cl5 that contains 2.6 x 1026 atoms of Cl.
2.6 x atoms Cl
x 1 molecs
x 1 mole
x g
= x104 g
1 mole
5 atoms Cl
6.02 x 1023 molec

7. Calculate the atoms of Cl in 25.0 g of P2Cl5.
25.0 g P2Cl5
x 1 mole
x x 1023 molec
x 5 atoms Cl
= x 1023 at Cl
1 molec
239.5 g
1 mole