Practice Quiz #3 Stoichiometry, Limiting Reactants & % Yield

What is the limiting reactant if 16 moles of NH₃ and 30.0 moles of NO are combined?

4NH₃ + 6NO --> 5N₂ + 6H₂O

• NH₃

• NO

• N₂

• water

Tags

NGSS.HS-PS1-7

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

Tags

NGSS.HS-PS1-7

Fe + S --> FeS

If 7.62g Fe and 8.67g S are combined, what is the limiting reactant?

• Fe

• S

• FeS

• none

What is the first thing you must do to solve a stoichiometry problem?

• Write a Balanced Equation
• Panic
• Write an Unbalanced Equation
• Avogadro's Number

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

Tags

NGSS.HS-PS1-6

What is the mole ratio of H₂O to H₃PO₄ in the following chemical equation?   P₄O₁₀ + 6 H₂O --> 4 H₃PO₄ 

• 6:4
• 4:6
• 1:3
• 3:1

Tags

NGSS.HS-PS1-7

SO₂ + PCl₅ --> SOCl₂ + POCl₃

How much SOCl₂ is produced when 16.2g SO₂ are combined with 13.7g PCl_5?

• 7.87g

• 30.1g

• 26.4g

• 19.8g

3CaCO₃ + 2FePO₄ --> Ca₃(PO₄)₂ + Fe₂(CO₃)₃

What is the maximum amount of each product that can be formed? (assuming 100. g CaCO₃ and 45 g FePO₄ from the previous problem are used)

• 85 g of calcium carbonate, 39 g of iron(III) phosphate

• 12.4 g of calcium phosphate, 27 g of iron(III) carbonate

• 37.2 g of calcium phosphate, 29.3 g of iron(III) carbonate

• 46.3 g of calcium phosphate, 43.8 g of iron(III) carbonate

Mercury (I) carbonate will break down when exposed to heat:

Hg₂CO₃ → Hg₂O + CO₂

How much Hg₂O will be formed when 2.50 g of Hg₂CO₃ is decomposed?

• 1.17 g

• 2.26 g

• 0.0977 g

• 4.00 g

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