Stoichiometry, Limiting Reactant, and percent yield

If 15 grams of copper (II) chloride react with 20 grams of sodium nitrate, how much sodium chloride can be formed? 

• 13.04 g
• 130.4 moles
• 130.4 g
• 13.04 moles

Tags

NGSS.HS-PS1-7

Identify the limiting reagent when 6.00 g HCl combines with 5.00 g Mg to form MgCl₂.
a.  Mg +  2HCl --> MgCl₂  +  H₂   
b.  a.  Mg +  2HCl --> MgCl₂  +  H₂   

• Mg
• H₂
• MgCl₂
• HCl

Fe₂O₃ + 3H₂ → 2Fe + 3H₂O
About how many grams of H₂O will be produced from 150 grams of Fe₂O₃? 

• 50 grams H₂O
• 60 grams H₂O
• 5000 grams H₂O
• 6000 grams H₂O

Tags

NGSS.HS-PS1-7

2Fe₂O₃  +  C  →  Fe  +  3CO₂
You add 28 grams of carbon. You find the actual yield to be 181.2 grams of CO₂. What is the percent yield of CO₂? (Hint: calculate theoretical yield of CO₂ first)

• 15.8%
• 209.2%
• 6435%
• 15.5

Tags

NGSS.HS-PS1-7

3NH₄NO₃ + Na₃PO₄ --> (NH₄)₃PO₄ + 3 NaNO₃

The reaction above allows you to make NaNO_3. Assuming we start with 30 g of NH₄NO₃ and 50 g of Na₃PO₄ , identify the limiting reactant.

• ammonium phosphate (NH₄)₃PO₄

• sodium phosphate Na₃PO₄

• ammonium nitrate NH₄NO₃

• sodium nitrate NaNO₃

Tags

NGSS.HS-PS1-7

NGSS.HS-PS1-2

You need 2 pieces of bread, 1 tablespoon of peanut butter and 2 tablespoons of jelly to make a sandwich.  If you have 10 pieces of bread, 4 tablespoons of peanut butter and 20 tablespoons of jelly, what is the limiting reactant?

• bread
• jelly
• peanut butter
• sandwich

4NH₃ + 5O₂ --> 4NO + 6H₂O
How many grams of NO are formed if 6.30g of ammonia react with 1.80g of oxygen? 

• 0.37g
• 0.045g
• 1.35g
• 11.1g

Tags

NGSS.HS-PS1-7

P₄ + 6Cl₂ --> 4PCl₃ 
The reaction of 75.0g P₄ with excess chlorine gas produces 110g PCl₃ in lab. Find the theoretical yield and calculate percent yield for the reaction. 

• 78%
• 64%
• 27%
• 33%

Tags

NGSS.HS-PS1-7

In a lab, a scientist calculate he should produce 12.3 grams of product in his experiment. When he is finished collecting his product it weighs 10.1 grams. What is his percent yield?

• 82%
• 0.82%
• 10.1 %
• 100%

Tags

NGSS.HS-PS1-7

Cl₂ + 2KBr → Br₂ + 2KCl
How many grams of potassium chloride (KCl) can be produced from 356 g of potassium bromide (KBr)?

• 749 g
• 223 g
• 479 g
• 814 g

Tags

NGSS.HS-PS1-7