stoichiometry Chapter 10

Stoichiometry Fe + O2 – Fe2O3 Balanced: 4 Fe + 3 O2  2 Fe2O3 This means that 4 atoms of Iron and 3 molecules of O2 combine to make 2 molecules of Fe2O3

Mole Ratio K + Br2  KBr 2KClO3  2KCl + 3O2

Mole Ratios Determine all possible mole ratios for the following balanced chemical equations. 4Al + 3O2  2Al2O3 3Fe + 4H2O  Fe2O4 + 4H2 2HgO +  2Hg + O2

Stoichiometric calculations

Using Stoichiometry K + H2O  KOH + H2 How many moles of Hydrogen will be produced when 3 moles of K react with excess water? C3H8 + 5O2  3CO2 + 4H2O How many molecules of CO2 are produced when 10.0 moles of C3H8 is burned with an excess amount of O2?

Mass Calculations Na + H2O  NaOH + H2 How many grams of NaOH can be produced from the reaction of 22.98 grams of Na? How many grams of H2 can be produced from the reaction of 24 g of H2O?

Why do reactions stop?

Limiting and excess reactants

When the limiting reactant runs out the reaction will stop

Calculations S8 + 4Cl2  4S2Cl2 If 200.0 g of S8 reacts with 100.0 g of Cl2 what is the mass of S2Cl2 produced?

b.) How many grams of the excess reactant is left over? 16Ag + S8  8Ag2S a.) If 4.00 g of Ag and 4.00 g of S8 react, which is the limiting reactant? b.) How many grams of the excess reactant is left over? c.) How many grams of Ag2S will be produced? Ag, 3.4 g S8 left, 4.56 g Ag2S

b.) How many grams of the excess reactant will be left over? 2Al + 3I2  2AlI3 a.) If 54.0 g of Al reacts with 508 g of I2, which is the limiting reactant? b.) How many grams of the excess reactant will be left over? c.) How many grams of product will be produced? I2, 16.19 g Al left, 570.77 g of AlI3 produce.