Limiting Reactant and Molar Ratios

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

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

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

SO₂ + PCl₅ --> SOCl₂ + POCl₃
How much of the excess is left over when 16.2g SO₂ react with 13.7g PCl_5? 

• 13.0g
• 3.16g
• 70.3g
• 54.1g 

P₄ + 3O₂ --> P₄O₆ 
What is the limiting reactant is 12 moles of P₄ react with 15 moles of O₂?

• P₄
• O₂
• P₄O₆ 
• none of the above

Al + HBr --> AlBr₃ + H₂
Balance the following equation. What is the coefficient for HBr?

• 2
• 6
• 3
• 1

Tags

NGSS.HS-PS1-7

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

How many grams of FeS are formed from 7.62g of Fe reacted with excess S?

• 3.82g
• 7.62g
• 12.2g
• 11.4g 

Tags

NGSS.HS-PS1-7

C₃H₈ + 5O₂ --> 3CO₂ + 4H₂O
How much carbon dioxide is produced when 3.0g of propane is burned in 2.1g of oxygen? 

• 0.55g
• 0.038g
• 2.9g
• 0.90g

When does a reaction stop?

• When it wants to
• When both the limiting and excess reactants are gone
• When all the excess reactant has been consumed
• When all the limiting reactant has been consumed