Free Printable Mole ratio

1.

Mole Ratios used for conversions are derived from:

a)

the molar mass of the reactants in the balanced chemical equation

b)

the coefficients of the balanced chemical equation

c)

the subscripts of the products in the balanced chemical equation

d)

the group number of each element in the balanced chemical equation

2.

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

AlPO₄ + Ba(OH)₂ → Al(OH)₃ + Ba₃(PO₄)₂

_{balance it}

a)

3 mol Ba(OH)₂ / 2 mol AlPO₄

b)

1 mol Ba(OH)₂/ 1 mol AlPO₄

c)

2 mol Ba(OH)₂/ 3 mol AlPO₄

d)

1 mol Ba(OH)₂/ 3 mol AlPO₄

3.

What is the mole ratio of Mg to MgCl₂?

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

_{balance it}

a)

2 mol Mg/ 1 mol MgCl₂

b)

1 mol Mg/ 2 mol MgCl₂

c)

1 mol Mg/ 1 mol MgCl₂

d)

2 mol Mg/ 2 mol MgCl₂

4.

1Mg_(s) + 2HCl_(aq) →1MgCl_2(aq) + 1H_2(g)

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

a)

2.5

b)

1.25

c)

5.0

d)

1.0

5.

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

C₃H₈ +5O₂ → 3CO₂ + 4H₂O

a)

4 mol H₂O/ 5 mol O₂

b)

5 mol O₂/ 4 mol H₂O

c)

2 mol O₂/ 4 mol H₂O

d)

4 mol O₂/ 2 mol H₂O

6.

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

a)

1 mol C₃H₈/ 5 mol O₂

b)

5 mol O₂/ 1 mol C₃H₈

c)

5 mol O₂/ 10 mol C₃H₈

d)

10 mol C₃H₈/ 5 mol O₂

7.

Using the reaction below,

4Al + 3O₂ → 2Al₂O₃

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

a)

8 mol

b)

6 mol

c)

4 mol

d)

2 mol

8.

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

4Al + 3O₂ → 2Al₂O₃

a)

3 mol Al/ 2 mol Al₂O₃

b)

2 mol Al₂O₃/ 4 mol Al

c)

4 mol Al/ 2 mol Al₂O₃

d)

2 mol Al₂O₃/ 3 mol Al

9.

When setting up a problem using mole ratios, remember to use dimensional analysis. Start with the given. The unit that the given has needs to be on bottom in the next frame so it will cancel out. Make sure to label with both unit and chemical formula.

Using the following BALANCED chemical equation....
If I decompose 34 moles of HgO, how many moles of oxygen will I produce? What will the ratio that you use look like in this problem?

$\frac{34\ moles\ HgO}{ }\times\frac{\ \ \ \ \ ?\ \ \ \ }{?}$

a)

$\frac{1mole\ O_2}{2\ mole\ HgO}$

b)

$\frac{2\ mole\ HgO}{1\ mole\ O_2}$

c)

$\frac{2\ mole\ Hg}{1\ mole\ O_2}$

10.

When setting up a problem using mole ratios, remember to use dimensional analysis. Start with the given. The unit that the given has needs to be on bottom in the next frame so it will cancel out. Make sure to label with both unit and chemical formula.

Using the following BALANCED chemical equation.... $4NH_3+6NO\rightarrow5N_2+6H_2O$
Bacteria will cause ammonia $NH_3$ to react with NO to put nitrogen back in the air, along with water, as part of the nitrogen cycle. If there are 3.56 moles of NO in the soil, how many moles of ammonia are needed to react with it?

$\frac{3.56\ moles\ NO}{ }\times\frac{\ \ \ \ \ ?\ \ \ \ }{?}$

a)

$\frac{\ 6\ mole\ NO}{4\ mole\ NH_3}$

b)

$\frac{2\ mole\ NH_3}{3\ mole\ NO}$

c)

$\frac{6\ mole\ Hg}{5\ mole\ N_2}$

11.

When setting up a problem using mole ratios, remember to use dimensional analysis. Start with the given. The unit that the given has needs to be on bottom in the next frame so it will cancel out. Make sure to label with both unit and chemical formula.

Using the following BALANCED chemical equation.... $4NH_3+6NO\rightarrow5N_2+6H_2O$
How many moles of water will be produced with 3.56 moles of NO in the soil?

$\frac{3.56\ moles\ NO}{ }\times\frac{\ \ \ \ \ ?\ \ \ \ }{?}$

a)

$\frac{\ 6\ mole\ NO}{6\ mole\ H_2O}$

b)

$\frac{1\ mole\ H_2O}{1\ mole\ NO}$

c)

$\frac{6\ mole\ H_2O}{5\ mole\ N_2}$

12.

2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

A problem asks how many moles of oxygen gas are needed to react completely with 6 moles of ethane (C₂H₆). What is the final answer for this problem?

a)

13 mol C₂H₆

b)

3 mol O₂

c)

21 mol O₂

d)

42 mol O₂

13.

2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

New problem: How many moles of ethane (C₂H₆) are required to produce 13.5 moles of water from the above reaction?

a)

4.5 mol C₂H₆

b)

27 mol C₂H₆

c)

40.5 mol C₂H₆

d)

81 mol C₂H₆

e)

162 mol C₂H₆

14.

The limiting reactant

a)

slows the reaction down

b)

is used up first

c)

is the reactant that is left over

d)

controls the speed of the reaction

Mole ratio

Total questions: 14

Worksheet time: 8mins

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