Limiting Reactant/Excess Reactant/Percent Yield

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

What is a limiting reactant?

• the reactant that determines how much product can be made
• the reactant that is in excess
• the product that you can make the most of
• the amount of reactants that react with each other

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-7

4NH₃ + 5O₂ --> 4NO + 6H₂O

How many grams of NO are formed if 6.30 g of ammonia (NH₃) react with 1.80 g of oxygen?

• 0.37g

• 0.045g

• 1.35g

• 11.1g

SO₂ + PCl₅ --> SOCl₂ + POCl₃
How much SOCl₂ is produced when 16.2g SO₂ react with 13.7g PCl_5? 

• 7.87g
• 30.1g
• 26.4g
• 19.8g 

Tags

NGSS.HS-PS1-7

1 Cheese + 2 Bread --> 1 grilled cheese
How many grilled cheeses can you make with 26 slices of bread and 14 pieces of cheese?

• 14
• 13
• 26
• 7

1 Body + 4 Tires --> 1 car
How many cars can you make with 92 tires and 34 bodies? 

• 23
• 34
• 68
• 46

Which mole ratio is correct for the given chemical equation?

2N₂ (g) + 5O₂ (g) -----> 2N₂O₅ (g)

• 2 mol N₂ to 5 mol N₂O₅

• 2 mol N₂ to 2 mol N₂O₅

• 5 mol O₂ to 2 mol NO₂

• None are correct.

What is the conversion factor that allows you to convert from substance A to substance B?

• Mole ratio

• Avogadro's number

• 22.4 L

• the mass of the substance

Fe + S --> FeS
If 7.62g Fe react with 8.67g S, what is the limiting reactant?

• Fe
• S
• FeS
• none 

Tags

NGSS.HS-PS1-7

When 12 moles of O₂ reacts with 1.1 mole of C₁₀H₈ what is the limiting reactant?  
C₁₀H₈  +  12 O₂  →  10 CO₂  +  4 H₂O

• O₂
• C₁₀H₈
• H₂O
• Carbon Dioxide