Molar Ratio Lesson

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

What are the missing coefficients for the unbalanced equation below?

Cr_(s) + Fe(NO₃)_2(aq) → Fe_(s) + Cr(NO₃)_3(aq)

• 2,3,3,2

• 1,3,3,1

• 2,3,2,3

• 2,3,1,2

What are the missing coefficients for the unbalanced equation below?

AlPO₄ + Ba(OH)₂ → Al(OH)₃ + Ba₃(PO₄)₂

• 1,3,2,3

• 2,3,2,3

• 3,2,3,1

• 2,3,2,1

Tags

NGSS.HS-PS1-7

What is the mole ratio of Ba(OH)₂ to AlPO₄?

AlPO₄ + Ba(OH)₂ → Al(OH)₃ + Ba₃(PO₄)₂

• 3 mol Ba(OH)₂ / 2 mol AlPO₄

• 1 mol Ba(OH)₂/ 1 mol AlPO₄

• 2 mol Ba(OH)₂/ 3 mol AlPO₄

• 1 mol Ba(OH)₂/ 3 mol AlPO₄

What is the mole ratio of Mg to MgCl₂?

Mg_(s) + HCl_(aq) → MgCl_2(aq) + H_2(g)

• 2 mol Mg/ 1 mol MgCl₂

• 1 mol Mg/ 2 mol MgCl₂

• 1 mol Mg/ 1 mol MgCl₂

• 2 mol Mg/ 2 mol MgCl₂

Mg_(s) + HCl_(aq) →MgCl_2(aq) + H_2(g)

The reaction of 2.5 mol of HCl will produce ______ mol of MgCl_2.

• 2.5

• 1.25

• 5.0

• 1.0

If there are 2 moles of oxygen available, which mole ratio will tells how much water is produced?

C₃H₈ +5O₂ → 3CO₂ + 4H₂O

• 4 mol H₂O/ 5 mol O₂

• 5 mol O₂/ 4 mol H₂O

• 2 mol O₂/ 4 mol H₂O

• 4 mol O₂/ 2 mol H₂O

If there are 10 moles of propane, C₃H₈, which mole ratio will tells how much oxygen is required for the reaction to take place?

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

• 1 mol C₃H₈/ 5 mol O₂

• 5 mol O₂/ 1 mol C₃H₈

• 5 mol O₂/ 10 mol C₃H₈

• 10 mol C₃H₈/ 5 mol O₂

Which mole ratio tells how much aluminum oxide is produced from 3 moles of aluminum?

4Al + 3O₂ → 2Al₂O₃

• 3 mol Al/ 2 mol Al₂O₃

• 2 mol Al₂O₃/ 4 mol Al

• 4 mol Al/ 2 mol Al₂O₃

• 2 mol Al₂O₃/ 3 mol Al

Tags

NGSS.HS-PS1-7

Using the reaction below,

4Al + 3O₂ → 2Al₂O₃

How many moles of aluminum oxide are produced from 6 moles of oxygen?

• 8 mol

• 6 mol

• 4 mol

• 2 mol