Chemical Calculations
- Created by: 500daysofluce
- Created on: 26-03-14 19:06
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- Chemical Calculations
- Number of moles in a..
- ...solution
- moles = volume x concentration
- ...compound
- moles = m*** ÷ Mr
- ...gas
- moles = volume ÷ 24dm (molar m***)
- ...solution
- 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 (m*** of product obtained ÷ maximum theoretical m***)
- atom economy = 100 x (m*** of required product ÷ total m*** of reactants)
- Other
- Emission and Absorption Spectra
- c = freq x wavelength
- E=hf
- f proportional to 1/wavelength
- Relative atomic m*** (from m*** spec) = sum of (relative percantage abundance x charge/m*** ratio) ÷ sum of relative percentage abundance
- Empircal formula = E(lement) M(***) A(r) R(atio)
- Emission and Absorption Spectra
- Kinetics
- rate = change in concentration ÷ time
- delta H = Eaf - Eab
- Number of moles in a..
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