Chemical Calculations

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  • Chemical Calculations
    • Number of moles in a..
      • ...solution
        • moles = volume x concentration
      • ...compound
        • moles = mass ÷  Mr
      • ...gas
        • moles = volume ÷ 24dm (molar mass)
    • Energetics
      • delta H = Hproducts - Hreactants
      • Hess's Law delta H1 = delta H2 + delta H3
      • delta H = sum of delta H (products) - sum of delta H (reactants)
      • mcAT [÷ n] = delta H (J[permol])
      • delta H = sum of broken bonds - sum of bonds formed
    • products obtained
      • percentage yield = 100 x (mass of product obtained ÷ maximum theoretical mass)
      • atom economy = 100 x (mass of required product ÷ total mass of reactants)
    • Other
      • Emission and Absorption Spectra
        • c = freq x wavelength
        • E=hf
        • f proportional to 1/wavelength
      • Relative atomic mass (from mass spec) = sum of (relative percantage abundance x charge/mass ratio) ÷ sum of relative percentage abundance
      • Empircal formula = E(lement) M(ass) A(r) R(atio)
    • Kinetics
      • rate = change in concentration ÷ time
      • delta H = Eaf - Eab

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