Limiting Reactants Stoichiometry of Balanced Equations 2 Most

Limiting Reactants Stoichiometry of Balanced Equations 2

Most problems assume that there are excess reactants so that all reactants are converted to products… This is not always the case!

Limiting Reactant that limits the reaction When it is used up, it stops the reaction from continuing Excess reactant Reactant that is not completely used up during the reaction

Limiting Reactant Questions Given: Amount of each reactant Chemical Equation Steps to Solving: Balance the Equation Determine the amount of product each reactant will make The reactant that makes the least amount of product is limiting You can use the amount of product formed from the limiting reactant to determine the amount of excess for the other reactant

Practice Problem 1 If you start with 4 moles of HCl and 4 moles of Zn, which is the limiting reactant? HCl + Zn Zn. Cl 2 + H 2

Practice Problem 2 If you start with 4 moles of HCl and 4 moles of Zn, what is the maximum amount of each product that can be formed? HCl + Zn Zn. Cl 2 + H 2

Practice Problem 3 If you start with 4 moles of HCl and 4 moles of Zn, how much is left over of the excess reactant? HCl + Zn Zn. Cl 2 + H 2

Practice Problem 4 Which of the reactants is the limiting reactant in the following problem, if you start with 30 g of H 2 and 50 g of N 2? N 2 + H 2 NH 3

Practice Problem 5 If you start with 30 g of H 2 and 50 g of N 2, state the amount of product left over for the excess reactant? N 2 + H 2 NH 3