1. Mole Calculations Part Three

2. Calculate the number of O atoms in 250. g of CO 2. O C O Note, there are 2 O's for each CO 2 molecule = 6.84 x10 24 atoms O 1 molec CO 2 x 2 atoms O 1 mole x 6.02 x 10 23 molec 44.0 g x 1 mole250. g CO 2

3. Calculate the mass of CuSO 4. 6H 2 O that contains 6.93 x 10 25 atoms of O.

4. O O S 2-- OO O O O O O o Cu 2+ There are 10 O atoms in one formula unit Octahedron

5. Calculate the mass of CuSO 4. 6H 2 O that contains 6.93 x 10 25 atoms of O. = 3.08 x 10 3 g 1 mole x 267.72 g 6.02 x 10 23 FU x 1 mole 10 atoms O x 1 FU 6.93 x 10 25 atoms O

6. Calculate the mass of P 2 Cl 5 that contains 2.6 x 10 26 atoms of Cl. = 2.1 x10 4 g 1 mole x 239.5 g 6.02 x 10 23 molec x 1 mole 5 atoms Cl x 1 molecs2.6 x 10 26 atoms Cl

7. Calculate the atoms of Cl in 25.0 g of P 2 Cl 5. = 3.14 x 10 23 at Cl 1 molec x 5 atoms Cl 1 mole x 6.02 x 10 23 molec 239.5 g x 1 mole25.0 g P 2 Cl 5