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Thermodynamics help!!: Endothermic/exothermic

  • 12-11-2010 3:23am
    #1
    kelxx
    Registered Users, Registered Users 2 Posts: 20 ✭


    Mixture:
    T1(°c)
    T2 (c°)
    NaCl + H2O
    25°
    21.74°
    NaCh3COO + H2O
    25°
    29.96°

    Given the initial(T1) and final(T2) temperatures in the reactions above:
    (1) Find ΔT(°C) where ([FONT=Calibri,Calibri][FONT=Calibri,Calibri]ΔT= T2 – T1[/FONT][/FONT])

    (2) Determine whether or not the reaction is endothermic or exothermic and why?

    (3)What is the sign of the change in the enthalpy ([FONT=Calibri,Calibri][FONT=Calibri,Calibri]ΔH[/FONT][/FONT]) in each case and explain why?


Comments

  • #2
    cianl1
    Closed Accounts Posts: 336 ✭✭cianl1


    kelxx wrote: »
    Mixture:
    T1(°c)
    T2 (c°)
    NaCl + H2O
    25°
    21.74°
    NaCh3COO + H2O
    25°
    29.96°

    Given the initial(T1) and final(T2) temperatures in the reactions above:
    (1) Find ΔT(°C) where ([FONT=Calibri,Calibri][FONT=Calibri,Calibri]ΔT= T2 – T1[/FONT][/FONT])

    (2) Determine whether or not the reaction is endothermic or exothermic and why?

    (3)What is the sign of the change in the enthalpy ([FONT=Calibri,Calibri][FONT=Calibri,Calibri]ΔH[/FONT][/FONT]) in each case and explain why?

    I'll assume you can do part 1 yourself there.

    So, part 2: remember exothermic emits heat, endothermic adsorbs heat.

    And for part 3: If something is giving off heat enthalpy has a minus sign and vice versa.

    Should be enough to get you started.


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