Moles

Moles

Why are moles useful?

How many footballs could I fit inside the harrow swimming pool?

moles = mass/relative formula mass

If everyone in China held hands how long would the line be? Would it be long enough to go around the world?

How many in each of these sets?

How many pieces of paper do you need to make a stack that would go up to the moon? (384,400 km)

How many moles are in 1.2 g of carbon?

A googol

A dozen

Moles

How many chickens are eaten each year?

A century

A pair

Sage and scribe

A grand

A score

How many grains of sand are on the earth?

The relative atomic mass of each element or compound tells us how much a mole of that substance weighs.

half a dozen

A ton

A bakers dozen

A mole

Complete the worksheet in pairs. Take turns on questions.

A monkey

It is the number of atoms in 12g of carbon-12

How much does a water molecule weigh?

https://what-if.xkcd.com/4/

It is made of two hydrogens and one oxygen

1 + 1 + 16 = 18

The mass of one mole of a compound is equal to the formula mass of the compound

Moles = mass/Mr

4

How much does a mole of water weigh?

How much does a mole of salt (NaCl) weigh?

How much does half a mole of copper sulphate (CuSO ) weigh?

How many moles is 25 grams of gold?

How many moles is 48 grams of Sulfuric acid (H SO )

What is meant by Avogadro's number?

What value does Avogadro's number have?

Suggest why you might want to measure an amount in terms of number of particles or number of moles as well as in grams.

How many atoms are in 2 g of carbon?

4

2

Why do the same amount of molecules weigh different amounts?

This is known as its molecular mass or relative formula mass (Mr)

Worksheet 1

What percentage of waters mass is oxygen?

(16/18) x 100

This is known as percentage by mass

worksheet