Stoichiometry Review

If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the

• theoretical yield
• mole ratio
• actual yield
• percentage yield

Tags

NGSS.HS-PS1-7

What is the measured amount of a product obtained from a chemical reaction in an experiment?

• mole ratio
• theoretical yield
• percentage yield
• actual yield

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NGSS.HS-PS1-7

NGSS.HS-PS1-6

Mole ratios are obtained from the

• coefficients in a balanced chemical equation

• periodic table
• molar mass

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

2Al + 3H₂SO₄ -> Al₂(SO₄)₃ + 3H₂
How many grams of aluminum sulfate would be formed if 250g H₂SO₄ completely reacted with aluminum?

• 0.85 g
• 290 g
• 450 g
• 870 g

Tags

NGSS.HS-PS1-7

Cl₂ + 2KBr → Br₂ + 2KCl

How many grams of KCl can be produced from 356 grams KBr?

• 749 g
• 225 g
• 479 g
• 814 g

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-PS1-7

NGSS.HS-PS1-6

Identify the limiting reagent when 6.00 g HCl combines with 5.00 g Mg to form MgCl₂.
 
Mg +  2HCl --> MgCl₂  +  H₂   
 

• Mg
• H2
• MgCl2
• HCl

Tags

NGSS.HS-PS1-7

LiOH + KCl → LiCl + KOH 

6.0g of LiCl was produced in an experiment. However, through stoichiometry calculations, it was found that 35.5g of LiCl should have been produced. What is the percent yield?

• 16.9%

• 5.91%

• 1.88%

• 12.3%

Tags

NGSS.HS-PS1-7

3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe

What is the Ratio of moles of MgO to moles Fe?

• 3mol Mg / 2 mol Fe
• 2 mol Mg/ 3 mol Fe
• 1 mol Fe/ 2 mol Fe
• 3 mol MgO / 2 mol Fe

Tags

NGSS.HS-PS1-7