Free Printable The Mole & Stoichiometry

Worksheets

The Mole & Stoichiometry

Total questions: 62

Worksheet time: 3hrs 6mins

Name

Class

Date

The mole is 6.022 x 10²³ atoms or molecules of any substance. This number is also named after the scientist who calculated it. This was:

Perrin

Avogadro

Einstein

Newton

How do you find the molar mass for an element?

Molar mass is the same as atomic mass, only in grams

You convert into molar mass from a mass given to you

You can only be given molar mass, it can't be calculated

It is equal to Avogadro's Number

How many moles of Carbon would be in 3 moles of CH₄?

How many moles of Hydrogen would be in 5 moles of CH₄?

How many grams is one mole of Sodium?

32.07

118.71

150.36

22.99

How many grams is 2 moles of Helium?

4.00

8.00

2.02

4.04

How many moles are 156.00 grams of Chromium?

How many moles would 91 grams of Magnesium be?

8.4

2.5

3.6

What is the molar mass of Sucrose (C₁₂H₂₂O₁₁)?

182.00 g

45.00 g

342.34 g

377.85 g

10.

40 moles of Helium (He) would have a mass of:

160 g

80 g

320 g

6.022 x 10²³ g

11.

What is the mass of 4 moles of Ammonia (NH₃)?

40 g

17.04 g

68.16 g

10 g

12.

Which has a higher mass, 2 moles of Phosphorus (P) or 4 moles of Sodium (Na)

2 mol P

4 mol Na

13.

Which has a higher mass, 2 moles of Carbon (C) or 3 moles of Beryllium (Be)?

3 mol Be

2 mol C

14.

Which has more atoms, 2 moles of Phosphorus (P) or 4 moles of Sodium (Na)?

2 mol P

4 mol Na

15.

Which has more atoms, 4 moles of He, or 2 moles of H₂?

H₂

Neither

16.

The molar mass of an element is equal to its...

Atomic mass

Atomic number

Oxidation number

Valence electrons

17.

The mass of one mole of substance is called...

molecular mass

mole constant

molar mass

atomic weight

18.

What is the molar mass of sodium?

45.98

19.

What is the molar mass of fluorine gas?
(beware!)

18.998 g/mol

38 g/mol

9 g/mol

18 g/mol

20.

What is the mass of one mole of aluminum?

27 g

13 g

54 g

14 g

21.

What is the molar mass of table salt (NaCl)?

116.886 g/mol

35.453 g/mol

22.990 g/mol

58.443 g/mol

22.

What is the molar mass of NaOH?

40 g/mol

38.989 g/mol

23.998 g/mol

57.004 g/mol

23.

What is the mass of one mole of aluminum chloride (remember to determine the correct formula first)?

62.435g

116.399g

133.341g

97.888g

24.

What is the molar mass of CO₂?

25.

How many particles are in a mole?

602

602 million

602 moles

6.02 x 10²³

26.

Which list of number of atoms in Mg(NO₃)₂ is right?

Mg : 1--NO : 6

Mg : 1-- N : 6--O: 6

Mg : 1-- N: 1-- O: 5

Mg : 1-- N: 2-- O: 6

27.

At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?

the product is doubled

the product is half the mass of the reactants

the mass is the same

the mass changes depending on the reaction

28.

Balance this equation:
2Li + Cl₂ → LiCl

2Li + Cl₂ → 4LiCl₂

2Li + Cl₂ → LiCl₂

2Li + Cl₂ → 2LiCl

2Li + 2Cl₂ → 2 LiCl₂

29.

How many Mn atoms are found in the following compound?
3Cr(MnO₄)₆

30.

Is the following reaction balanced?
NaHCO₃ --> Na₂CO₃ + H₂O + CO₂

yes

31.

Balance this equation

_Al +_HCl --> _H₂+_AlCl₃

2,6,3,2

it's already balanced

4,12,3,4

2,1,4,5

32.

What is the first thing you must do to solve a stoichiometry problem?

Write a Balanced Equation

Panic

Write an Unbalanced Equation

Ask for help

33.

For the Balanced Reaction:
3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe;
What is the Ratio of moles of Mg to moles Fe?

3mol Mg / 2 mol Fe

2 mol Mg/ 3 mol Fe

1 mol Fe/ 2 mol Fe

3 mol MgO / 2 mol Fe

34.

Select the correct molar ratio taken from this balanced equation:

4 Al + 3 O₂ --> 2 Al₂O₃

1 mol Al = 1 mol Al₂O₃

4 Al = 2 Al₂O₃

4 mol Al = 2 mol Al₂O₃

4 mol Al = 2 mol Al

35.

4 Al + 3 O₂ --> 2 Al₂O₃

_{How many moles of}Al₂O_{3 will be produced from 250.0 g of Al?}

_{( 26.982 g Al = 1 mol Al)}

18.531 mol Al₂O₃

4.633 mol Al₂O₃

6.949 mol Al₂O₃

12.354 mol Al₂O₃

36.

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)

What is the mole ratio of hydrogen gas to nitrogen gas?

1:3

3:1

1:2

2:1

37.

If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the

theoretical yield

mole ratio

actual yield

percentage yield

38.

What is the measured amount of a product obtained from a chemical reaction?

mole ratio

theoretical yield

percentage yield

actual yield

39.

What is a Excess Reagent?

amount you end with

what you run out of first

what you have left over

what you start with

40.

When does a chemical reaction stop?

When the lab is finished

When the excess reactant is used up

When the limiting reactant is used up

Chemical reactions never stop

41.

You need 2 pieces of bread, 1 tablespoon of peanut butter and 2 tablespoons of jelly to make a sandwich. If you have 10 pieces of bread, 4 tablespoons of peanut butter and 20 tablespoons of jelly, what is the limiting reactant?

bread

jelly

peanut butter

sandwich

42.

Which conversion factor should be used for the following question " How many molecules are there in 4.00 moles of glucose, C₆H₁₂O₆?

1 mole = 78.12 g

1 mole = 22.4 L

1 mol = 6.02x 10²³ particles

more than one

43.

Which conversion factor should be used to solve the following, "How many moles in 28 grams of CO₂?"

1 mol = 22.4 L

1 mol = 44.01 g

1 mol = 6.02x10²³ atoms

more than one

44.

The number 6.02 x 10²³, which is the number of particles found in a mole.

molar mass

mole

Avogadro's number

hydrate

45.

Which of the following dimensional analysis setups will correctly convert 27.76g of Li to atoms of Li?

46.

The mass of one mole of an element is equal to

its atomic number from the periodic table, but in amus.

its atomic mass from the periodic table, but in amus.

its atomic mass from the periodic table, but in grams.

its atomic number from the periodic table, but in grams.

47.

A balanced chemical equation allows one to determine the

mole ratio of any two substances in the reaction.

energy released in the reaction.

electron configuration of all the elements in the reaction.

mechanism involved in the reaction.

48.

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

10:6

3:4

2:3

4:3

49.

When you balance a chemical equation, you are following:

the Law of Conservation of Mass

the Law of Conservation of Energy

the Law of Motion

atomic theory

Coulomb's Law of Attraction

50.

A mole is not:

Avogadro's number

6.02 x 10^23rd

12.01 grams of C

14.01 grams of N

16.00 grams of water

51.

What is the molar mass of C₆H₁₂O₆?

180.18 g/mol

180.12 g/mol

180.24 g/mol

180.06 g/mol

52.

If you start with atoms of NaOH and are going to moles of NaOH, how many steps is it?

53.

How many steps is grams to grams?

54.

How many steps is moles to moles?

55.

How many steps is grams to moles of the same compound?

56.

How many steps is grams to moles of different compounds?

57.

How many steps is moles to grams of different compounds?

58.

If you want to go to grams of a compound, you first have to get to __________________ of the compound

moles

atoms

molecules

molarity

59.

When starting with grams, what goes on the bottom of the first step?

grams

moles

molecules

atoms

60.

When starting with moles, what goes on the bottom of the first step?

grams

moles

molecules

atoms

61.

Any time you get grams off the periodic table, the other part of the equation is

1 mole

grams

moles from balanced equation

moles from the problem

62.

The numbers for the mole ratio (middle step of grams to grams) come from

periodic table

Avogadro's number

number of moles from balanced equation

moles given in the problem

100 %

The Mole & Stoichiometry

Total questions: 62

Worksheet time: 3hrs 6mins

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