Mole CalculationsPart Three

Calculate the number of O atoms in 250. g of CO2.

O C O Note, there are 2 O's for each CO2

molecule

= 6.84 x1024 atoms O1 molec CO2

x 2 atoms O 1 mole

x 6.02 x 1023 molec 44.0 g

x 1 mole 250. g CO2

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

OOS2--

OO

O

O

O

O

O

oCu2+

Cu2+

There are 10 O atoms in one formula unit

Octahedron

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

= 3.08 x 103 g 1 mole

x 267.72 g6.02 x 1023 FU

x 1 mole 10 atoms O

x 1 FU 6.93 x 1025 atoms O

Calculate the mass of P2Cl5 that contains 2.6 x 1026 atoms of Cl.

= 2.1 x104 g1 mole

x 239.5 g 6.02 x 1023 molec

x 1 mole 5 atoms Cl

x 1 molecs 2.6 x 1026 atoms Cl

Calculate the atoms of Cl in 25.0 g of P2Cl5.

= 3.14 x 1023 at Cl1 molec

x 5 atoms Cl 1 mole

x 6.02 x 1023 molec 239.5 g

x 1 mole 25.0 g P2Cl5