Percent Yield and Limiting Reagent

1. What is a limiting reagent?

• any reactant used up first in a reaction.
• any reactant left over at the end of a reaction.
• the maximum amount of product formed from a given amount of reactant.
• the purity of the reactant.

Tags

NGSS.HS-PS1-7

4. If the quantities of reactants are given in units other than moles, what is the first step for determining the amount of product?

• Determine the amount of product from the given amount of limiting reagent.
• Convert each given quantity of reactant to moles.
• Identify the limiting reagent.

5. Which reactant is the limiting reagent and why?
2H₂(g) + O₂(g)  → 2H₂O(l)

• Hydrogen is the limiting reagent because two moles of hydrogen is required for every one mole of oxygen to produce two water.
• Oxygen is the limiting reagent because two moles of hydrogen is required for every one mole of oxygen to produce two water.

Tags

NGSS.HS-PS1-7

11.
LiOH + KCl → LiCl + KOH    
a)  I began this reaction with 20 grams of lithium hydroxide.  What is my theoretical yield of lithium chloride? 

• 35.5 grams
• 11.3 grams
• 0.03 grams
• 0.09 grams

Tags

NGSS.HS-PS1-7

11.
LiOH + KCl → LiCl + KOH 

b)  I actually produced 6 grams of lithium chloride and I began this reaction with 20 grams of lithium hydroxide. What is my percent yield?

• 16.9%
• 5.91%
• 1.88%
• 12.3%

Tags

NGSS.HS-PS1-7

14.
FeBr₂ + 2 KCl → FeCl₂ + 2 KBr    
a)  What is my theoretical yield of iron (II) chloride if I start with 34 grams of iron (II) bromide?

• 20.0 grams
• 14.4 grams
• 31.7 grams
• 22.9 grams

Tags

NGSS.HS-PS1-7

14.
FeBr₂ + 2 KCl → FeCl₂ + 2 KBr 
b)  What is my percent yield of iron (II) chloride if I started with 34 grams of iron(II) bromide and my actual yield is 4 grams?

• 20%
• 28%
• 13%
• 17%

Tags

NGSS.HS-PS1-7

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

Tags

NGSS.HS-PS1-7

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

Tags

NGSS.HS-PS1-7

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

• 1.16%
• 116%
• 85%
• 76%

Tags

NGSS.HS-PS1-7