# Equations For Edexcel Chemistry

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• Created by: Justin
• Created on: 03-06-13 21:04
Calculating concentrations of unknown solutions
Number of Moles = Volume (cm3) x Concentration (dm-3) / 1000
1 of 10
Percentage Uncertainty = uncertainty in the value / value x 100
2 of 10
Yield
Theoretical Yield = Molar Mass of Products / Molar Mass of Reactants x Mass of Reactants (kg)
3 of 10
Atom Economy
Mass of Atoms in Desired Products / Mass of Atoms in All Reactants x 100
4 of 10
Concentration
g dm-3 = Mass of Solute (g) / Volume of Solution (dm3) or mol dm-3 = Amount of solute (mol) / Volume of Solution (dm3)
5 of 10
Relative Atomic Mass
Relative Atomic Mass (Ar) = Sum of Individual Isotopes x Individual Relative Abundance (%) / 100
6 of 10
Molecular Formula
Molecular Formula = Empirical Formula x Molecular Mass/ Empirical Formula Mass
7 of 10
Moles
Moles = Mass of Substance / Molar Mass
8 of 10
Concentration
Concentration (ppm) = Number of parts of the chemical / number of parts it is contained in x 10 to the power of 6
9 of 10
Energy Transferred
Energy Transferred (KJ) = Mass x Speific Heat Capacity (4.18) x Temperature Change
10 of 10

## Other cards in this set

### Card 2

#### Front

Percentage Uncertainty = uncertainty in the value / value x 100

### Card 3

#### Front

Theoretical Yield = Molar Mass of Products / Molar Mass of Reactants x Mass of Reactants (kg)

### Card 4

#### Front

Mass of Atoms in Desired Products / Mass of Atoms in All Reactants x 100

### Card 5

#### Front

g dm-3 = Mass of Solute (g) / Volume of Solution (dm3) or mol dm-3 = Amount of solute (mol) / Volume of Solution (dm3)