Mole and Volume Conversions

Multiple Choice

What is the volume of 5.62 moles of O₂?

• 125.9 L

• 0.25 L

• 179.8 L

• 0.18 L

Multiple Choice

What is the volume (in liters) of 3.20 moles of H₂O?

• 71.7 L

• 0.14 L

• 0.17 L

• 57.6 L

Multiple Choice

What is the volume of 25.2 moles of N₂?

• 564.5 L

• 1.125 L

• 705.6 L

• 0.9 L

Multiple Choice

What is the volume of 45.6 moles of NH₃?

• 1021.4 L

• 2.0 L

• 2.68 L

• 775.2 L

Multiple Choice

What is the volume of 1.75 moles of CO₂?

• 39.2 L

• 0.08 L

• 77.0 L

• 0.04 L

Multiple Choice

How many moles are in 56.7 L of CO₂?

• 2.5 moles

• .25 moles

• 1.3 moles

• 2494.8 moles

Multiple Choice

How many moles are in 23.1 L of nitrogen gas (N₂)?

• 1.0 moles

• 517.4 moles

• 0.825 moles

• 646.8 moles

Multiple Choice

How many moles are in 505.6 L of H₂?

• 22.6 moles

• 11325.4 moles

• 252.8 moles

• 1011.2 moles

Multiple Choice

How many moles are in 0.5 L of CH₄?

• 0.02 moles

• 11.2 moles

• 0.3 moles

• 8 moles

Multiple Choice

How many moles are in 608.2 L of NH₃?

• 27.2 moles

• 13,623.68 moles

• 35.8 moles

• 10,339.4 moles

Mole to Mole Ratio

​

Multiple Choice

Balance this equation:
P₄+O₂  -->  P₂O₃

• 3 P₄+ O₂ --> 2 P₂O₃
•  P₄+ O₂ --> 2 P₂O₃
•  P₄+ 3 O₂ --> 2 P₂O₃
•  P₄+ 2 O₂ --> 3 P₂O₃

Multiple Choice

Balance this equation

_Zn+_HCl-->_ZnCl₂ +_H₂

• 1,1,2,1

• 1,1,1,2

• 1,2,1,1

• 2,1,1,1

Multiple Choice

N₂ + 3H₂ → 2NH₃

What is the mole ratio between Nitrogen and Ammonium in the above reaction?

• 1 moles NH₃ / 2 moles N₂

• 2 moles NH₃ / 1 moles N₂

• 2 moles N₂ / 3 moles NH₃

• 1 moles N₂ / 3 moles NH₃

Multiple Choice

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

Multiple Choice

4NH₃ + 5O₂-->4NO + 6H₂O

What is the total number of moles of NO produced when 1 mole of O₂ is completely consumed?

• 1

• 1.2

• 0.8

• 4

Multiple Choice

6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂

What is the total number of moles of water needed to make 2.5 moles of C₆H₁₂O₆?

• 2.5

• 6

• 12

• 15

Multiple Choice

6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂

What is the total number of moles of CO₂ needed to make 2 moles of C₆H₁₂O₆?

• 2.5

• 6

• 12

• 15

Multiple Choice

4NH₃ + 5O₂-->4NO + 6H₂O

What is the total number of moles of H₂O produced when 12 mole of NH₃ is completely consumed?

• 15

• 18

• 20

• 24

The Mole Concept

By Guzman

Counting Atoms

A Chemist's Dozen

1 mole = 6.022 x 10²³ particles

• 1 dozen = 12 objects

• 1 score = 20 objects

​

• The MOLE

  • 1 mole equals the amount of substance that contains 6.0221421 x 10²³ particles

Avogadro's Number & Molar Mass

​The mass of one mole of a substance is called Molar Mass (MM)

• Units are g​/mol

• In an element 1 mole is equal to its Atomic Mass​

Molar Mass

1 mole of atoms of any element will have a mass equal to its relative Atomic Mass

• Its shown in grams​

​Once Again

​1 Mol = 23 grams

2 Mol =

3 Mol =

​Examples

How many grams are in 2 mol of Carbon (C)?

1. Look for the element

2. Look at the atomic mass

3. multiply the mol they are asking for​

Multiple Choice

How many particles are found in a mole?

• $$6.022\ x\ 10^{23}$$  

• $$6.022\ x\ 1023$$  

• $$6022\ x\ 10^{23}$$  

• $$6022\ x\ 1023$$  

Multiple Choice

What are the units used for Molar Mass

• grams

• mols

• g/mol

• mol/g

Multiple Choice

How many grams are in 1 mole of Mg?

• 12 grams

• 24 grams

• 36 grams

• 6.022 x 10²³ grams

Multiple Choice

How many grams are in 3 mol of carbon?

• 6 grams

• 12 grams

• 18 grams

• 36 grams

Multiple Choice

How many grams are in 5 mol of lithium

• 3 grams

• 15 grams

• 35 grams

• 7 grams

Multiple Choice

How many grams are in 10 mol of fluorine?

• 19 grams

• 190 grams

• 90 grams

• 9 grams

Formula Weight

​Its the sum of all the atomic weights in a formula.

to find the formula weight of a compound:

1. fin the number of atoms of each element present in the compound

2. multiply the number of atoms by their respective weight

3. add the atomic weights of all the elements present.

Example: H₂O

1. H₂O contains 2 atoms of Hydrogen and 1 atom of Oxygen​

   ​

2. Hydrogen: 2 x 1.0080 = 2.016

Oxygen: 1 x 16 = 16

​

3. 2.016 + 16 = 18.016

Multiple Choice

what are the units used for Molecular Weight?

• amu

• grams

• g/mol

• mol

Multiple Choice

Find the formula weight of Sugar - C₁₂H₂₂O₁₁

• 198.176 amu

• 342.308 amu

• 144.132 amu

• 29.019

Multiple Choice

Find the molecular weight of Vitamin A - C₂₀H₃₀O

• 286.46 amu

• 240.22 amu

• 29.019 amu

• 129.46 amu

Multiple Choice

Find the molecular weight of carbon monoxide - CO

• 16 amu

• 12.011 amu

• 28.011 amu

• 29.019 amu

Multiple Choice

Find the molecular weight of acetic acid - CH₃COOH

• 24.022 amu

• 31.035 amu

• 29.019 amu

• 60.054 amu

Putting these together

​Gram Formula Mass

• ​This is the combination of formula weight and mol

• Moles are used not only to describe elements, but compounds as well.

• When asked about the weight of 1 mol of a compound, you will follow the same steps as finding the molecular weight of your compound.​

• its units are g/mol​

​

​Example

Determine the gram formula mass of each compound: KMnO₄

(this is asking for the mass of one mol of your compound)

​

K = 1 x 39.098 = 39.098

Mn = 1 x 54.938 = 54.938

O = ​4 x 16 = 64

= 158.036​ g/mol

Multiple Choice

What are the units used for Gram Formula Mass?

• amu

• grams

• mol

• g/mol

Multiple Choice

Determine the gram formula mass of KCl

• 74.548 amu

• 35.45 amu

• 74.548 g/mol

• 35.45 g/mol

Multiple Choice

Determine the gram formula mass of H₂SO₄

• 98.076 mol

• 98.076 g/mol

• 98.076 g

• 98.076 amu