Stoichiometry Exam Review

Which type of reaction is represented by this equation?

• synthesis

• decomposition

• single replacement

• double replacement

What is the gram formula mass of Mg(ClO₃)₂?

• 107 g

• 142 g

• 174 g

• 191 g

Which mass of oxygen completely reacts with 4.0 grams of hydrogen to produce 36.0 grams of water?

• 8.0 g

• 16.0 g

• 32.0 g

• 40.0 g

What is the percent composition by mass of hydrogen in NH₄HCO₃ (gram-formula mass = 79 grams/mole)?

• 5.1%

• 6.3%

• 10%

• 50%

Which formula is an empirical formula?

• N₂O₄

• NH₃

• C₃H₆

• P₄O₁₀

When the equation is completely balanced using smallest whole numbers, the coefficient of O₂ is

• 5

• 2

• 3

• 10

When the equation is correctly balanced using the smallest whole numbers, the coefficient of Al(s) is

• 1

• 2

• 3

• 4

What is the total number of moles of oxygen atoms in 1 mole of N₂O₃?

• 1

• 2

• 3

• 5

What is the empirical formula of a compound whose composition by mass is 50.% sulfur and 50.% oxygen?

• SO

• SO₂

• SO₃

• S₂O₃

A compound consists of 25.9% nitrogen and 74.1% oxygen by mass. What is the empirical formula of the compound?

• NO

• NO₂

• N₂O

• N₂O₅