Molar Ratio

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

• 2:7

• 2:6

• 6:2

• 7:2

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

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

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

Mole Ratios used for conversions are derived from:

• the molar mass of the reactants in the balanced chemical equation

• the coefficients of the balanced chemical equation

• the subscripts of the products in the balanced chemical equation

• the group number of each element in the balanced chemical equation

Tags

NGSS.HS-PS1-7

• 1:1

• 2:1

• 1:2

• 2:2

Tags

DOK Level 1: Recall

• 1 mole

• 2 moles

• 4 moles

• 8 moles

Tags

DOK Level 2: Skill/Concept

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

• 2 moles

• 3 moles

• 6 moles

• 9 moles

Tags

DOK Level 3: Strategic Thinking

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