Limiting reactant
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Transcript of Limiting reactant
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LIMITING REACTANT
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LIMITING REACTANT• Limiting Reagent• The reactant that is totally
used up during the chemical reaction
• Limits the amount of product produced
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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
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• What is the limiting reactant?• What are the excess
reactants?
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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
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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
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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
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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