Stoichiometry PRACTICE Test

2 KClO₃ → 2 KCl + 3 O₂

How many moles of oxygen are produced when 6.7 moles of KClO₃ decompose completely?

• 6.7 mol

• 1.0 mol

• 10. mol

• 4.5 mol

• none are correct

Tags

NGSS.HS-PS1-7

2Na + 2H₂O → 2NaOH+ H₂

How many grams of hydrogen are produced if 120 g of Na are available?

• 5.2 g

• 2.6 g

• 690 g

• 45 g

• none are correct

Tags

NGSS.HS-PS1-7

CH₄ + 2 O₂ → CO₂ + 2 H₂O

How many moles of carbon dioxide are produced from the combustion of 110. g of CH₄?

• 13.7 mol

• 2.75 mol

• 6.11 mol

• 6.85 mol

• none are correct

Balance the following reaction :

CaC₂ + H₂O --> C₂H₂ + Ca(OH)₂

• 1,2,2,2

• 1,2,1,1

• 2,1,1,1

• 2,1,2,1

• none are correct

In the equation 2 Al₂O₃ --> 4 Al + 3 O₂, what is the mole ratio of aluminum to oxygen (aluminum is asked for, oxygen is given)?

• 10/6

• 3/4

• 4/3

• 2/3

• none are correct

N₂ + 3H₂ → 2NH₃

How many moles of hydrogen are needed to react with 2 moles of nitrogen?

• 6

• 2

• 3

• 1

• none are correct

2H₂ + O₂ → 2H₂O

How many moles of water can be produced if 8 moles H₂ are used?

• 4 moles

• 10 moles

• 16 moles

• 2 moles

• none are correct

Tags

NGSS.HS-PS1-7

KNO₃ --> KNO₂ + O₂

What coefficients are needed to balance the reaction?

• 2, 2, 1

• 2, 3, 2

• 1, 2, 2

• 1, 3, 1

• none are correct

Tags

NGSS.HS-PS1-7

What is the mole ratio of P₄O₁₀ to H₃PO₄ in the following chemical equation?

P₄O₁₀ + 6 H₂O → 4 H₃PO₄

• 4:1

• 4:6

• 1:4

• 6:4

• none are correct

Tags

NGSS.HS-PS1-7

Al + H₂SO₄ -> Al₂(SO₄)₃ + H_2. (balanced?)

How many grams of aluminum sulfate would be formed if 515 g H₂SO₄ completely reacted with aluminum?

(round ans to correct sig figs, no labels)

Tags

NGSS.HS-PS1-7