Molecular and Empirical Formula - As OCR Chemistry Unit 1

Throughout my AS level chemistry i have endeavored to create a collection of my class notes and revision notes, that i will type up and folder. So i can use them for revision purposes, but then i thought how time consuming this is for me, probably why i didn't think of this sooner!
So i have decided to share all my class notes and revision resources on here for other people studying whom don't have the time to sit and type them all up :)

This Particular one is only short, stating the definitions of Molecular and Empirical Formula's and giving two worked examples.

If you would like anything requested please feel free to comment, i will be adding more and more through out the course. 

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Molly Graystone ­ Chemistry

Molecular & Empirical Formula

Empirical Formula:

o The simplest whole number ratio of atoms of each element in a compound.


3.53g of Fe (iron) reacts with 6.71g of Cl (chlorine). Find the empirical formula of the iron

o 3.53 : 6.71
56 35.5


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Molly Graystone ­ Chemistry


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