get link This topic is taught at both GCSE and at A level.
Hydrogen peroxide has a molecular formula of H2O2. Whilst its Empirical formula is HO. Benzene has a molecular formula of C6H6. Whilst its Empirical formula is CH. An empirical may not actually exist in real life, its just a way of cancelling the number of atoms on a piece of paper.
que es trileptal de 25 mg So the questions will either ask you to cancel an existing formula like above or they will give you percentages or masses of elements in a compound.
Four step process to dealing with an empirical formula question:
1. Put the elements at the top of the page
2. Put the masses or % under each element
3. Divide by atomic mass
4. Then divide by smallest.
However, there are a few sneaky questions and tricks that they can use. I will show you them in videos. As the videos progress they show progressively harder questions.
1. Calculate the empirical formula of a hydrocarbon that contains 85.7% carbon and 14.3% hydrogen.