Unit 7: Stoichiometry Test Review

N₂ + 3 H₂ → 2 NH₃

How many moles of H₂ are needed to react with 2 moles of N₂?

• 6

• 2

• 3

• 1

Tags

NGSS.HS-PS1-7

2 H₂ + O₂ → 2 H₂O

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

• 4 moles

• 8 moles

• 16 moles

• 2 moles

In the reaction 2 H₂ + O₂ → 2 H₂O what is the mole ratio of oxygen to water?

• 1:2
• 2:1
• 3:4
• 4:3

Determine the mass of Ca(OH)₂ produced when 0.64 grams of H₂O are used in the following reaction:

CaC₂ + 2 H₂O → Ca(OH)₂ + C₂H₂

• 10.31 g Ca(OH)₂

• 41.31 g Ca(OH)₂

• 1.31 g Ca(OH)₂

• 31 g Ca(OH)₂

Tags

NGSS.HS-PS1-7

Determine the mass of LiOH produced when 0.38 g of Li₃N is added to the following reaction:

Li₃N + 3 H₂O → NH₃ + 3 LiOH

• 11.78 g LiOH

• 0.78 g LiOH

• 12.78 g LiOH

• 21.78 g LiOH

Tags

NGSS.HS-PS1-7

The reaction of Zn with HCl should theoretically produce 0.42 grams of H₂. The reaction actually produced 0.15 grams of H₂. What is the percent yield of H₂?

• 2.8%

• 280%

• 1%

• 36%

Tags

NGSS.HS-PS1-7

Which of the following molecular formulas is also an empirical formula?

• C₇H₂₁

• N₂H₄

• S₄O₉

• H₂O₂

A compound has an empirical formula of CH₂, and its molecular formula has a molar mass of 70 g/mol. What is the molecular formula of this compound?

• C₃H₆

• CH₂

• C₅H₁₀

• C₇H₁₄

4 NH₃ + 5 O₂ → 4 NO + 6 H₂O

What is the theoretical yield of NO if 6.30 g of NH₃ react with 1.80 g of O₂?

• 0.37 g

• 0.045 g

• 1.35 g

• 11.1 g

Tags

NGSS.HS-PS1-7

Using the equation 2 Al + 3 Cl₂ → 2 AlCl_3,

If 54 g of Al and 142 g of Cl₂ react, identify the limiting reactant.

(NOTE: Cl is chlorine)

• AlCl₃

• Cl₂

• Al

• There is no limiting reactant.

Tags

NGSS.HS-PS1-7