What is a mole?

 

A mole is simply a number, an amount of something. Like when people refer to a dozen of eggs they mean 12 eggs, when someone says a mole of atoms they mean 6.022 x 1023 atoms. A mole is simply defined as ‘the amount of a substance containing 6.022 x 1023 particles.’ 6.022 x 1023 is 602,200,000,000,000,000,000,000 when written out in full – it’s a huge number! It is called Avogadro’s number after the man that calculated this. So you can literally have a mole of anything for example a mole of apples mean you have 6.022 x 1023 apples!

The reason why we have the mole is so that chemists can do calculations. If you look at a periodic table, under the symbol for each element there is a number, for example for sodium that number is 22.990. This number is how much 1 mole of sodium weighs in grams so 1 mole of sodium weighs 22.990g. This is called the molar mass: ‘the mass in grams of 1 mole of atoms of a given element.’

So the key this to remember is a mole is just a number: 6.022 x 1023. This is something which you will use in GCSE chemistry and even more if you decide to do A-Level chemistry!

CH
Answered by Charlotte H. Chemistry tutor

11923 Views

See similar Chemistry GCSE tutors

Related Chemistry GCSE answers

All answers ▸

Magnesium chloride is an ionic compound and has a high melting point. Explain why magnesium chloride has a high melting point?


How can potassium form an ionic compound with sulphur?


What are the different types of bonding?


Why doesn't the concentration of products or reactants change when a reaction is at dynamic equilibrium?


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences