Formula mass hyperlearning

• Science
• Upper Secondary (Key Stage 4)
• GCSE

Formula mass Hyperlearning

What are you going to learn?

In this lesson you're going to learn how to . . .

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How many atoms of each element in a chemical

How to look up relative atomic mass and calculate formula mass

apply your learning

00:14

Which sub-atomic particles make up the atomic mass?

1. protons and electrons
2. protons and neutrons
3. neutrons and electrons
4. protons, neutrons and electrons

00:27

What is the correct term for atoms of the same element that have different atomic masses?

1. isotopes
2. ions
3. elements
4. atoms

00:43

What is the relative atomic mass of chlorine shown in the periodic table?

01:01

What terms means a chemical that contains 2 or more elements chemically bonded to each other?

01:19

How many atoms of magnesium are there in magnesium chloride?

01:30

What is the rest of the sum for magnesium chloride, 24 +

01:41

Which of the following is the correct composition of Sulfuric acid?

1. (2 x H) + S + (4 x O)
2. 4 x (2H + S + O)
3. H + S + (4 x O)
4. (8 x H) + (4 x S) + (4 x O)

Atomic mass

• This is protons + neutrons
• Each of these sub-atomic particles has a mass of 1

• electrons have a mass of virtually 0 so are not included in the mass
• All the mass of an atom is therefore in the nucleus
• The atomic number is just the number of protons

Chemical formulae

• Each capital letter in a formula is a new element
• Some element symbols have a capital and a lowercase letter in their symbol
• If there is no subscript number after then there is one atom of that element in the chemical
• The subscript number only tells you about the number of atoms of the element just before the number

Formula mass

This is the mass of every atom in the chemical added together

• You get the relative atomic  mass of each element from the periodic table
• You then multiply each relative mass by the number of atoms there are of that element in the chemical
• You then add all the numbers together

Worked example

Calcium carbonate

(1 x Ca) + (1 x C) + (O x 3)

= 40 + 12 + (16 x 3)

= 52 + 48

= 100

Worked example

Glucose

(6 x C) + (12 x H) + (O x 6)

= (6 x 12) + (12 x 1) + (16 x 6)

= 72 + 12 + 96

= 180

Write down the atoms of each element in aluminium oxide

Write down the atoms of each element in hydrochlroic acid

Write down the atoms of each element in methane

Write down the atoms of each element in copper sulfate

Write down the atoms of each element in sodium chloride

Write down the atoms of each element in magnesium oxide

Use your periodic table to work out the sum to calculate the relative formula mass of sodium chloride

Use your periodic table to work out the sum to calculate the relative formula mass of magnesium oxide

Use your periodic table to work out the sum to calculate the relative formula mass of Hydrochloric acid

Use your periodic table to work out the sum to calculate the relative formula mass of methane

Use your periodic table to work out the sum to calculate the relative formula mass of aluminium oxide

Use your periodic table to work out the sum to calculate the relative formula mass of glucose

Use your periodic table to work out the sum to calculate the relative formula mass of copper sulfate

Which chemical is this the formula mass sum for?
12 + (16 x 2)

1. 
2. 
3. 
4. 

Which chemical is this the formula mass sum for?
23 + 16 + 1

1. NaOH
2. NaBr
3. HBr
4. KOH

Which chemical is this the formula mass sum for?
2 x 19

1. 
2. 
3. 
4. 

Which chemical is this the formula mass sum for?
1 + 14 + (16 x 3)

1. 
2. 
3. 
4. 

Which chemical is this the formula mass sum for?
14 + (3 x 1)

1. 
2. 
3. 
4. 

Congratulations. You just finished the formula mass lesson!

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How did it go?

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What further learning are you going to complete?

Go through the lesson again on my own

Make flashcards with the key information

Use Seneca learning to go through this content

Do exam practice using physics maths tutor

Need help?

Video 

Watch this short video explaining formula mass:

https://www.youtube.com/watch?v=q49NwIrjaFw

Support

Go to a revision website to spend more time learning:

https://www.elevise.co.uk/gac3a.html

https://senecalearning.com/en-GB/