# Limiting reactant.

## Presentation on theme: "Limiting reactant."— Presentation transcript:

Limiting reactant

Limiting Reactant Limiting Reagent
The reactant that is totally used up during the chemical reaction Limits the amount of product produced

Excess Reactant Excess Reagent
The reactant present in a quantity that is greater than what is needed to react with the limiting reactant Remains after the limiting reactant has been used up

What is the limiting reactant?
What are the excess reactants?

Steps Balance the equation Identify the givens (there are 2!)
Identify what you want to find Use stoichiometry to solve The reactant with a smaller amount of product produced is the limiting reactant The other reactant is in excess

1 MgBr2 + 2 AgNO3 2 AgBr + 1 Mg(NO3)2
How many grams of silver bromide (AgBr) can be formed when solutions containing 50.0 g of MgBr2 and g of AgNO3 are mixed together? What is the limiting reactant? What is in excess? 1 MgBr AgNO AgBr + 1 Mg(NO3)2 50.0 g MgBr2 1 mol MgBr mol AgBr g AgBr g MgBr mol MgBr mol AgBr = 102 g AgBr 100.0 g AgNO3 1 mol AgNO mol AgBr g AgBr g AgNO mol AgNO mol AgBr = g AgBr Limiting Reactant (LR) = MgBr2 Excess Reactant (ER) = AgNO3

How many grams of hydrogen chloride can be produced from 1
How many grams of hydrogen chloride can be produced from 1.00 g of hydrogen and 55.0 g of chlorine? What is the limiting reactant? What is in excess? H2 + Cl HCl 1.00 g H mol H mol HCl g HCl 2.02 g H mol H mol HCl = 36.1 g HCl 55.0 g Cl mol Cl mol HCl g HCl 70.90 g Cl mol Cl mol HCl = 56.6 g HCl Limiting Reactant (LR) = H2 Excess Reactant (ER) = Cl2

Ba(NO3)2 + Na2SO4 BaSO4 + NaNO3
How many grams of barium sulfate (BaSO4) will be formed from g of barium nitrate (Ba(NO3)2) and g of sodium sulfate (Na2SO4)? What is the limiting reactant? What is in excess? Ba(NO3)2 + Na2SO BaSO4 + NaNO3 200.0 g Ba(NO3)2 1 mol Ba(NO3) mol BaSO g BaSO4 g Ba(NO3)2 1 mol Ba(NO3)2 1 mol BaSO4 = g BaSO4 150.0 g Na2SO4 1 mol Na2SO mol BaSO g BaSO4 g Na2SO mol AgNO mol BaSO4 = g BaSO4 Limiting Reactant (LR) = Ba(NO3)2 Excess Reactant (ER) = Na2SO4