Mass to Mass Problems - Jan26 Class

Lead (IV) Nitrate reacts with 5.0 g of potassium iodide. How many grams of lead (IV) nitrate are required?






Potassium Iodide:

















How many grams of O2 are produced from the decomposition of 3.0g of potassium chlorate?







If 5.0g of potassium chlorate decomposes, what volume of O2 at STP is produced?





If a 100mL solution of 2.0 M H2SO4 is neutralizd by sodium hydroxide, what mass of water is produced?




Percent Yield
- The theoretical yeild of a rxn is the expected (calculated) amount.
- The experimental amount is the actual yield:
% = Actual/theoretical x 100
Example: The production of urea CO(NH2)2 is given by: 2 NH3 + CO2 --> CO(NH2)2 + H2O

If 47.7 g of urea are produced when 1 mole of CO2 reacts, find the actual yield, theoretical yield and percent yield.
Actual yield: 47.7g
Theoretical yield: 1mol CO2 x 1 CO(NH2)2/1 mol CO2 x 60.1g / 1 mol = 60.1g
Percent yield: 47.7g / 60.1g x 100 = 79.4%