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: .. Enthalpy

  1. #1

    Jul 2011
    -
    716

    .. Enthalpy

    *
    Chemical ThermoDynamics
    . . ( ) .
    .
    . . . H2 O2 ( ) .
    Thermodynamic
    . .
    .
    .
    *
    State Function :
    ( ) ( ) :
    ∆F , ∆G , ∆S , ∆E , ∆H
    W , q
    .
    .


  2. #2

    Jul 2011
    -
    716

    : .. Enthalpy

    "∆G , ∆S , ∆H " .
    * ( ) :
    ( ) ∆H .
    ∆H = H ( products ) - H ( reactants )
    :
    1 .
    2 . .
    : :
    . :
    W ∆E = q +
    ( ) ( PV ) . :
    W = 0
    .
    [ ( PV ) ]
    q= ∆E
    q .
    .
    (∆V ) ( P ) ( P∆V ) . :
    ∆E = q - P∆V
    ( PdV ) (q) (∆E ∆V ) :
    ∆V = q ∆E + P
    (∆E ) (∆V ) enthalpy or heat ******* ) " H ") :
    H = E + PV
    (H) :
    V) H =∆ E + ∆(P ∆
    :
    ∆E + P∆ V ∆H =
    q )= P∆V + ∆E ) :
    [ ( PV ) ]
    = q ∆H
    (∆H ) ( ( H = E + PV .
    ( E ) (H = E + PV ) (∆E and ∆H ) .
    ( ) . ( H ) ( PV ) and ( E ) .
    ∆Hf :
    . 395.7 KJ .
    S (s) + O2(g) SO2(g) ∆Hr= - 296.83 KJ
    O2(g) SO3(g) ∆Hr = - 98.9 KJ SO2(g) +
    :
    O2(g) SO3(g) ∆Hr = -395.73 KJ S(s) + 1
    ( ) .
    . 25C (1) .
    . ∆Hr = ∆Hf .
    ∆Hf ( ) .


  3. #3

    Jul 2011
    -
    716

    : .. Enthalpy

    :

    .... . ∆Hr . HN3 294KJ C2H2 .
    ( HF ) . . 44.10 . .

    :
    :
    ∆Hr = ∆Hf = -74.81KJ
    . 74.81KJ :
    ( ) ∑∆Hr ( ) ∑∆Hf = ∆Hr
    ∆Hf ∆Hr . ( ) .
    :
    C8H18(l) . ( ) ∆Hr= -5470.68KJ . ∆Hf .
    :

    X 0 8(-393.52) 9(-285.83)
    -547.68 = ∆Hr
    -547.68 = (-3148.16) + (-2572.47)-( X + 0)
    X = (-3148.16)+(-2572.47)+ 5470.68
    X = -249.95KJ = ∆Hf , C8H18(l)
    ∆Hr . . ∆Hr .
    ( ∆Hr ) 25C .
    ( ) . ( ) ∆Hfus ∆Hvap . ∆Hr 25C . ∆Hr .
    * ....
    :
    .


  4. #4

    Jul 2011
    -
    716

    : .. Enthalpy

    ( ) . . ( ) . :
    . .
    :
    .
    .
    .
    ∆H=? CO(g) + ( ) C
    :
    CO2(g) ∆H = -282.0KJ CO (g) + (1)
    + O2(g) CO2(g) ∆H = -393.5KJ( ) C (2)
    ∆H :
    CO(g) + ( ) C
    .
    CO2(g) ∆H = -282.0KJ CO (g) + (1)
    + O2(g) CO2(g) ∆H = -393.5KJ( ) C (2)
    +CO2(g) CO(g) + +( ) C = CO2 (g) + CO (g) + ( ) C =
    ∆H = +282.0 KJ -393.0KJ = - 110.5 KJ
    :
    CO (g) ∆H= -110.5KJ + ( ) C
    .
    * :
    ( " disordered " ) . " enthropy " .
    . .
    :
    S .
    .
    H E ∆S . ∆S . O C . 0K " " " " . ∆S " qrev - " .
    qrev α ∆S


    " " CO 0K .


    " " CO 0K 180 .
    :
    .
    ∆S . :
    ∆S = qrev / T
    T " qrev " / / ( JK-1 ) .
    : Entropy Is astate function .


  5. #5

    Aug 2011
    -
    2,564

    : .. Enthalpy

    ..

  6. #6

    Aug 2011
    -
    3,025

    : .. Enthalpy






  7. #7

    Aug 2011
    2,846

    : .. Enthalpy

    Thank you so muach
    refresh

    refresh
    refresh


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