Mole to Mole conversions

• coefficients in balanced equations tell us number of moles reaced or produced 
• they can also be used as conversions factors

           3 X + Y ---> 2 Z

• What you need over what you have

Example: 
 

• If 0.15 moles of methane (CH4) are consumed in a combustion rxn how many moles of CO2 are produced?
• CH4 + 2 O2 ---> CO2 + 2H2O
• 1.5 moles of CH4 x 1 / 1 = 0.15 mol of CO2

Example:

• When 2.1 x 10^-2 mol of Aluminium Hydroxide react with Sulphiric acid. How many moles of Aluminium Sulphate are produced?
• 2 Al(OH)3 + 3 H2SO4 ---> 6 HOH + 1 Al2(SO4)3 
• 2.1 x 10^-2 mol x 1 / 2 = 4.2 x 10^-2 mol of Al2(SO4)3

Example:

• How many moles of Bauxite (Aluminium Oxide) are requred to produce 1.8 mol of pure Aluminium?

2 Al2O3 ---> 4 Al + 3 O2

• 1.8 moles of Aluminium x 2 / 4 = 0.9 mol of Aluminium Oxide

Example:

• When 1.5 mol of copper react with Iron (II) Chloride how many moles of Iron should be prodeced?
• Cu + FeCl2 ---> Fe + CuCl2
• 1.5 mol x 1 / 1 = 1.5 mol of Fe    

-Eva