Recent content by cnoa

  1. C

    What is the Significance of Standard Enthalpy of Reaction?

    http://en.wikipedia.org/wiki/Standard_enthalpy_of_reaction" of reactants (ΔHfO). My question is, why? And I also know that I can find http://en.wikipedia.org/wiki/Standard_enthalpy_of_reaction" (ΔHrO) by subtracting the bond energies of the reactants from the products. The result differs...
    • cnoa
    • Thread
    • Reaction Standard
    • Replies: 1
    • Forum: Chemistry
  2. C

    What is the significance of enthalpy in constant pressure systems?

    So in a constant pressure system if u = q + pv and h = u - pv that means h = q then what's the importance of enthalpy. Why do they say the enthalpy of the reaction is blah blah instead of the heat released or absorbed is blah blah.
  3. C

    (Thermodynamics) Why Do I Use U For Constant Volume and H For Constant Pressure

    Why Do I Use U For Constant Volume and H For Constant Pressure? Also, which can be calculated H, Q, U, W?
    • cnoa
    • Thread
    • Constant Constant pressure Pressure Thermodynamics Volume
    • Replies: 3
    • Forum: Thermodynamics
  4. C

    A Question About Buoyancy Force (I Think My Teacher Is Wrong)

    How can they be equal at that point? And where is the force that the string applies. By the way Fk = Buoyancy Force
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