Equations For Edexcel Chemistry 0.0 / 5 ? ChemistryCalculationsASEdexcel Created by: JustinCreated on: 03-06-13 21:04 Calculating concentrations of unknown solutions Number of Moles = Volume (cm3) x Concentration (dm-3) / 1000 1 of 10 Estimating uncertainties in your final answer 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
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