# The Mole

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• Created by: bio1423
• Created on: 05-11-13 19:20
Mole formula
Mole = mass over Ar
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A mole is
one mole of an element contains 6x10to the 23 atoms and has a mass in grams equal to the relative atomic mass
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Empirical formula is
The simplist/ smallest whole number ratio of the atoms of each element in a compound
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Molecular formula is
the actual number of atoms of each element in a compound
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To work out Empirical formula
Element I mass/g I Ar I mol=mass/Ar I divide by smallest mole
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Working out Molecular formula
Mr molecule over emprical formula, or Mr/EF
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Water of crystallisation
mass of water = mass of hydrated compound - mass anhydrous coompound
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Working out number of waters in hydrous compounds
Substance (compound, anhydrous form) I mass/g I Mr I mol=mass/Mr I divide by smallest mol
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Working out reacting masses
1. Mole = mass/Mr
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## Other cards in this set

### Card 2

A mole is

#### Back

one mole of an element contains 6x10to the 23 atoms and has a mass in grams equal to the relative atomic mass

### Card 3

#### Front

Empirical formula is

### Card 4

#### Front

Molecular formula is

### Card 5

#### Front

To work out Empirical formula