Molar Ratio Practice

Bornite, Cu₃FeS₃, is a copper ore used in the production of copper. When heated, the following reaction occurs: 2 Cu₃FeS₃(s) + 7 O₂(g) --> 6 Cu(s) + 2 FeO(s) + 6 SO₂(g) If 450 moles of bornite are reacted, determine the number of moles of copper produced.

• 750 mol bornite

• 1350 mol bornite

• 1525 mol bornite

• 150 mol bornite

Tags

NGSS.HS-PS1-7

How many moles of hydrogen gas are needed to react completely with 2.0 moles of nitrogen gas? What is the mole ratio of hydrogen gas to nitrogen gas?

• 1:3

• 3:1

• 1:2

• 2:1

How many moles of hydrogen gas are needed to react completely with 2.0 moles of nitrogen gas?

3 H₂(g) + N₂(g) --> 2NH₃(g)

• 3 mol H₂

• 6 mol H₂

• 2 mol H₂

• 4.5 mol H₂

Tags

NGSS.HS-PS1-7

What are the coefficients if this following equation was balanced? Al + O₂ --> Al₂O₃

• 2, 3, 1

• 3, 2, 1

• 1, 2, 3

• 4, 3, 2

Tags

NGSS.HS-PS1-7

• 2 moles

• 3 moles

• 6 moles

• 9 moles

Tags

DOK Level 3: Strategic Thinking

• 2.5 moles

• 5 moles

• 10 moles

• 15 moles

Tags

DOK Level 2: Skill/Concept

If you are going to solve a molar ratio problem, how do you set it up?

a

b

c

d

Moles A

Moles B

Calculated Moles B

Given Moles A

Tags

NGSS.HS-PS1-7

In the equation 2 Al₂O₃ → 4 Al + 3 O₂, what is the mole ratio of aluminum to oxygen?

• 10:6 

• 3:4

• 4:3

• 2:3

Tags

NGSS.HS-PS1-7

How many moles of aluminum are required to react with 5.09 moles of oxygen?

4Al + 3O₂ --> 2Al₂O₃

• 5.09 mol Al

• 7.52 mol Al

• 6.79 mol Al

• 15.62 mol Al

Tags

NGSS.HS-PS1-7

What are the coefficients if the following equation was balanced? _?_ C₄H₁₀ + _?_ O_{2 -->} _?_ CO₂ + _?_ H₂O

• 2, 5, 6, 2

• 2, 13, 8, 10

• 2, 7, 4, 10

Tags

NGSS.HS-PS1-7