Free Printable 6.5 Limiting Reagents and % Yield

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6.5 Limiting Reagents and % Yield

Total questions: 11

Worksheet time: 17mins

Name

Class

Date

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

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

4NH₃+6NO --> 5N₂ + 6H₂O

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

NH₃

N₂

water

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

1.16%

116%

85%

76%

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

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

SO₂+ PCl₅--> SOCl₂+ POCl₃

How many molecules of of SOCl₂ is produced when 16.2g SO₂react 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

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

spectator reagent

limiting reagent

excess reagent

catalyst

10.

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

11.

Al(OH)₃ + 3HCl --> 3H₂O + AlCl₃

14 grams of Al(OH)₃ is completely reacted with excess hydrochloric acid. If you actually recovered 22.0 grams of aluminum chloride, what is the percent yield of the reaction?

100%

25%

92%

69%

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6.5 Limiting Reagents and % Yield

Total questions: 11

Worksheet time: 17mins

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