6.5 Limiting Reagents and % Yield

The limiting reactant

• slows the reaction down

• is used up first

• is the reactant that is left over

• controls the speed of the reaction

2 Al + 3 Cl₂ ---> 2 AlCl₃.

If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.

• AlCl3

• Cl2

• Al

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NGSS.HS-PS1-7

When does a chemical reaction stop?

• When the lab is finished
• When the excess reactant is used up
• When the limiting reactant is used up
• Chemical reactions never stop

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4NH₃+6NO --> 5N₂ + 6H₂O

What is the limiting reactant if 10 moles of NH₃ react with 30.0 moles of NO?

• NH₃

• NO

• N₂

• water

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NGSS.HS-PS1-7

Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.

• 1.16%
• 116%
• 85%
• 76%

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NGSS.HS-PS1-7

4NH₃ + 5O₂ --> 4NO + 6H₂O

How many Liters of NO are formed if 6.30g of ammonia react with 1.80g of oxygen?

• 1.5 L

• 2.02 L

• 1.01 L

• 8.30 L

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NGSS.HS-PS1-7

If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the

• theoretical yield
• mole ratio
• actual yield
• percentage yield

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NGSS.HS-PS1-7

SO₂ + PCl₅ --> SOCl₂ + POCl₃

How many molecules of of SOCl₂ is produced when 16.2g SO₂ react with 13.7g PCl_5?

• 3.98 X 10²² molecules

• 1.52 X 10²³ molecules

• 4.19 X 10^-25 molecules

• 3.98 molecules

• 1.52 molecules

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NGSS.HS-PS1-7

3. The reactant that is not completely used up in a chemical reaction is called the __________ .

• spectator reagent
• limiting reagent
• excess reagent
• catalyst

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6Na + Fe₂O₃ --> 3Na₂O + 2Fe

If you are provided 200g of sodium and 250 grams of iron(III) oxide, how much of excess reagent is left?

• 232 g

• 18 g

• 250 g

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NGSS.HS-PS1-7