Limiting Reactant Practice

Fe + S --> FeS

If 7.62g Fe and 8.67g S are combined, what is the limiting reactant? (Fe = 55.85 g/mol; S = 32.07 g/mol)

• 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

• Oxygen

• C₁₀H₈

• Water

• Carbon Dioxide

CH₄ + 2H₂O --> CO₂ + 4H₂

How much of the excess reactant remains when 20.0g CH₄ and 16.0g H₂O are combined? [use H₂ as the product]

• 14.3 g

• 10.1g

• 3.59g

• 12.9 g

Tags

NGSS.HS-PS1-7

Which reactant is the limiting reagent and why?

• 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

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.

When 12 moles of O₂ reacts with 6 moles of C₁₀H₈, what is the limiting reactant?  
1 C₁₀H₈ + 12 O₂ --> 10 CO₂ + 4 H₂O

• Oxygen

• C₁₀H₈

• Water

• Carbon Dioxide

When the limiting reactant is used up, what happens?

• the reaction speeds up

• the reaction slows down

• the reaction moves to its 2nd stage

• the reaction stops

Which reactant is the limiting reagent and why?

• 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.MS-PS1-2

NGSS.MS-PS1-5

The limiting reactant

• .
• is used up first
• is the reactant that is left over
• .

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