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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 - PowerPoint PPT Presentation
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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?
STEPS1. Balance the equation2. Identify the givens (there are
2!)3. Identify what you want to find4. Use stoichiometry to solve5. The reactant with a smaller
amount of product produced is the limiting reactant
6. The other reactant is in excess
How many grams of silver bromide (AgBr) can be formed when solutions containing 50.0 g of MgBr2 and 100.0 g of AgNO3 are mixed together? What is the limiting reactant?
What is in excess?1 MgBr2 + 2 AgNO3 2 AgBr + 1 Mg(NO3)2
50.0 g MgBr2 1 mol MgBr2 2 mol AgBr 187.77 g AgBr
184.11 g MgBr2 1 mol MgBr2 1 mol AgBr
= 102 g AgBr
100.0 g AgNO3 1 mol AgNO3 2 mol AgBr 187.77 g AgBr
169.88 g AgNO3 2 mol AgNO3 1 mol AgBr
= 110.5 g AgBr
Limiting Reactant (LR) = MgBr2 Excess Reactant (ER) = AgNO3
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 + Cl2
HCl
1.00 g H2 1 mol H2 2 mol HCl 36.46 g HCl
2.02 g H2 1 mol H2 1 mol HCl= 36.1 g HCl
55.0 g Cl2 1 mol Cl2 2 mol HCl 36.46 g HCl
70.90 g Cl2 1 mol Cl2 1 mol HCl
= 56.6 g HCl
Limiting Reactant (LR) = H2 Excess Reactant (ER) = Cl2
How many grams of barium sulfate (BaSO4) will be formed from 200.0 g of barium nitrate (Ba(NO3)2) and 150.0 g of
sodium sulfate (Na2SO4)? What is the limiting reactant? What is in excess?
Ba(NO3)2 + Na2SO4 BaSO4 + NaNO3
200.0 g Ba(NO3)2 1 mol Ba(NO3)2 1 mol BaSO4 233.40 g BaSO4
261.35 g Ba(NO3)2 1 mol Ba(NO3)2 1 mol BaSO4
= 178.6 g BaSO4
150.0 g Na2SO4 1 mol Na2SO4 2 mol BaSO4 233.40 g BaSO4
142.05 g Na2SO4 2 mol AgNO3 1 mol BaSO4
= 246.5 g BaSO4
Limiting Reactant (LR) = Ba(NO3)2 Excess Reactant (ER) = Na2SO4