Molar Ratio

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)

What is the mole ratio of iron (II) oxide to sulfur dioxide?

• 2:7

• 2:6

• 6:2

• 7:2

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

Tags

NGSS.HS-PS1-7

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

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

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

a

b

c

d

Moles B

Moles A

Calculated Moles B

Given Moles A

Tags

NGSS.HS-PS1-7

• 2 moles

• 3 moles

• 6 moles

• 9 moles

Tags

DOK Level 3: Strategic Thinking

• 1:1

• 2:1

• 1:2

• 2:2

Tags

DOK Level 1: Recall

• 2 moles

• 4 moles

• 6 moles

• 8 moles

Tags

DOK Level 2: Skill/Concept

• mole

• moles

• moles

• moles

Tags

DOK Level 2: Skill/Concept

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