CHEM1102 Thermodynamics Equations

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247899
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CHEM1102 Thermodynamics Equations
Updated:
2013-11-19 18:41:24
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chemistry 1b equations thermodynamics
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CHEM1102 Thermodynamics Equations
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  1. First Law
    ΔEsys =
    • ΔEsys = qp + w
    • (+ve is endo, -ve is exo)
  2. Second Law
    ΔSuni =
    ΔSuni = ΔSsys + ΔSsurround
  3. Heat Capacity
    q = 
    (include units)
    • q = C x ΔT 
    • (in JK-1 or JK-1g-1)
  4. Calorimeter
    w = 
    ΔE =
    • w = -PexΔV
    • ΔE = q
  5. Heat (Enthalpy)
    H = 
    ΔH =
    H = E + PV

    ΔH = qp (heat added to system)
  6. Heat (Enthalpy)
    ΔH0 is 
    ΔfH0 is

    ΔreactionH0 =
    ΔH0 is standard enthalpy (1 atm, 250C)

    ΔfH0 is enthalpy of formation

    ΔreactionH0 = ΣnΔfH0(products) - ΣnΔfH0(reactants)
  7. Entropy
    ΔreactionS0 =
    ΔreactionS0 = ΣnΔS0(products) - ΣnΔS0(reactants)
  8. Entropy
    ΔSsys
    • ΔSsys = qrev   JK-1mol-1 (q is heat from                         T                     reversible change)
  9. Entropy
    ΔSsurround =
    • ΔSsurround = heat transfer in actual process
    •                                     T
    • = -qp = -ΔHsys
    •      T       T
  10. Gibb's Free Energy
    G = 
    ΔGsys =
    • G = H - TS
    • ΔGsys = ΔHsys - TΔSsys at constant T
  11. Gibb's Free Energy
    ΔreactionG0 =
    ΔreactionG0 = ΣnΔfG0(products) - ΣnΔfG0(reactants)
  12. Equilibrium
    ΔG0 =
    ΔG =
    • ΔG0 = - RT lnK
    • ΔG = ΔG0 + RT lnQ
  13. Spontaneity
    Signs in Spontaneity
    for Gsys and Suni

    Signs in Equilibrium

    • Gsys is -ve
    • Suni is +ve

    In Equi, both are = 0

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