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Thread: Q in Q = mcΔT

  1. #1 Q in Q = mcΔT 
    Forum Freshman Samuel P's Avatar
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    Does it simple stand for the heat exchange in a reaction? Or is it the enthalpy change in a reaction = mcΔT.

    Help is much appreciated ^_^

    EDIT: Apologies, that mess of numbers and symbols is meant to be a DELTA sign in the title.


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  3. #2  
    Forum Isotope Bunbury's Avatar
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    M.Cp.delta T is the sensible heat produced or absorbed in a reaction. If some of the products change state, for example water vapor is produced from an initially liquid set of reactants, you would have to account for the latent heat as well as the sensible heat to get the total heat of reaction.

    By the way this also applies to physical changes, such as heating and cooling without chemical reaction.


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  4. #3  
    Forum Freshman Samuel P's Avatar
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    Is the sensible heat not the potential heat of a reaction? if you measured the latent heat in a reaction would it not be in a reaction to figure out the sensible heat?

    What I meant was, what does the Q mean in Q = mc DELTA T

    Where m is mass of surroundings, c is specific heat capacity, DELTA T is change in temperature.

    Does the Q mean enthalpy change?
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  5. #4  
    Reptile Dysfunction drowsy turtle's Avatar
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    Q stands for the change in heat energy in the system, which in a reaction should theoretically be the same as the enthalpy change of the reaction.
    "The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at or repair." ~ Douglas Adams
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  6. #5  
    Forum Freshman Samuel P's Avatar
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    Thank you ^_^
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