Limiting 24

The limiting reactant

• slows the reaction down
• is used up first
• is the reactant that is left over
• controls the speed of the reaction

Using the equation, 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

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

Identify the limiting reactant if 10 moles of NH₃ react with 30.0 moles of NO, according to the equation,

4NH₃+ 6NO --> 5N₂ + 6H₂O

• NH₃

• NO

• N₂

• water

Tags

NGSS.HS-PS1-7

When 12 moles of O₂ gas reacts with 1.1 mole of naphthalene, C₁₀H₈, which reactant is in excess according to the following equation: C₁₀H₈ + 12 O₂ --> 10 CO₂ + 4 H₂O

• Oxygen gas

• Naphthalene

• Water

• Carbon Dioxide

Theoretical yield = 73g

Actual yield = 62g

Calculate the percent yield.

• 11%

• 118%

• 85%

• 0.85%

P₄ + 3O₂ --> P₄O₆

What is the limiting reactant if 12 moles of P₄ react with 15 moles of O₂?

• P₄

• O₂

• P₄O₆

• none of the above

Tags

NGSS.HS-PS1-7

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 75.0 g P₄ with excess chlorine gas produces 110 g PCl₃ in lab. Find the theoretical yield and calculate percent yield for the reaction.

• 78%

• 60.5%

• 54.6%

• 33.1%

• 68.2%

How many grams of FeS are formed when 7.62g of iron metal, Fe, react with excess sulfur, S₈?

• 3.82g

• 7.62g

• 12.0g

• 11.4g

Tags

NGSS.HS-PS1-7