Limiting Reactants Chem 2

If you are given a mass of a reactant, what is the first step to figuring out how much product can be made?

• Convert the mass into moles

• Find the mole ratio

• Add up the coefficients

• Find the molar mass of every substance in the reaction

When converting between two substances in a chemical reaction, what information will change the substance you have?

• The molar mass (from the periodic table)

• The mole ratio (coefficients)

• The surrounding oxygen

• The theoretical yield

The limiting reactant is the substance that....

• slows the reaction down.

• is used up first.

• is the reactant that is left over.

• controls the speed of the reaction.

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 3 moles of O₂ reacts with .33 mole of C₁₀H₈ what is the limiting reactant? C₁₀H₈ + 12 O₂ --> 10 CO₂ + 4 H₂O

• Oxygen

• C₁₀H₈

• Water

• Carbon Dioxide

Use the equation 2 Al + 3 Cl₂ ---> 2 AlCl₃. If 2 moles of aluminum and 2 moles of chlorine are combined, identify the limiting reactant.

• AlCl₃

• Cl₂

• Al

2CO + O₂ → 2CO₂

In the reaction above, 7.62 g CO are allowed to react with 8.67 g O₂.

How much CO₂ is formed?

Molar Masses: CO=28.01g/mol

O₂=32.00g/mol

CO₂ = 44.01g/mol

• 11.9 g CO₂

• 12.0 g CO₂

• 23.8 g CO₂

• 35.8 g CO₂

What is the limiting reactant if 10 moles of NH₃  react  with 30.0 moles of NO?
4NH₃+6NO --> 5N₂ + 6H₂O

• NH₃
• NO
• N₂
• water

P₄ + 3O₂ --> P₄O₆

How many moles of P₄O₆ can be made if 3 moles of P₄ react with 6 moles of O₂?

• 1 mole

• 2 moles

• 4 moles

• 0 moles