C2 Maths Skills

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  • Created by: Lizzi
  • Created on: 19-05-13 16:53

Moles

(http://farm3.staticflickr.com/2891/8753472225_f1bb172166_m.jpg)

 Mr is the total relative mass of a compound

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Empirical Formula

It's the simplest ratio of the atoms or ions in a compound.


Empirical formula for an 80% carbon hydrocarbon

Carbon

Hydrogen

Mass in 100g

80

20

Ratio of atoms/ moles (mass/Ar)

80/12=6.67

20/1=20

Simplest ratio of atoms (divide by smallest)

6.67/6.67=1

20/6.67=3

Empirical Formula

CH3

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Percentages (yield and and % of an element in a co

Percentage of an element in a formula:

(Element's Ar/Compound's Mr)x100= percentage in compound

Percentage yield:

(Amount of product collected/Maximum possible yield)x100= percentage yield

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Rate of Reaction

A reaction's 'rate of reaction' is calculated by: 

Amount of reactant used/Time

OR

Amount of product formed/Time

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