Chemistry Calculation Formulae

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  • Created by: ChloeLW
  • Created on: 29-03-18 22:16

Moles

Number of Moles = Mass in g (of Element or Compound)

                             Mass of Compound or Atomic Mass

Image result for Moles calculation triangle (http://www.bbc.co.uk/staticarchive/f190a2db298b64559185132af90f44924c2d8bf6.png)

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Concentration

Concentration =       Mass of Solute     

                           Volume of Solution

Image result for concentration calculation triangle (http://www.bbc.co.uk/staticarchive/1aa904d8defdc42eff8479c03db7cce42900f2ba.jpg)

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Rf Value

Rf Value =   Distance travelled by solute   

                 Distance travelled by solvent

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Titration Concentration Calculations

Concentration =    number of moles   

                           volume of solution

Image result for concentration calculation triangle (http://slideplayer.com/5664117/18/images/3/Concentration+%3D+no.+of+moles+volume.jpg)

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Percentage Yield

Percentage Yield =     actual yield     x100 

                    theortical yield

Theortical yield sometimes needs to be calculated first: 

Mass = moles x relative atomic number

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Atom Economy

Atom Economy = total mass of desired products x100

                    total mass of all products

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Molar Volume

Molar Volume =       gas volume    

                           number of moles

Image result for Molar volume calculation triangle

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Molar Volumes are the same under the same conditio

Volume = Moles x 24

Image result for Molar volume under conditions Triangle (http://slideplayer.com/5275059/17/images/6/MOLES+%3D+volume+THE+MOLAR+VOLUME+MOLAR+volume.jpg)

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Rate of Reaction

Rate of Reaction =   amount of reactant used   

                              Time

Rate of Reaction =   amount of product formed  

                                 Time

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