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Thread: Calculating Enthalpy changes help please

  1. #1 Calculating Enthalpy changes help please 
    Forum Senior Booms's Avatar
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    Sep 2008
    The perceptual schematic known as earth
    ok I understand how to Calculate enthalpy changes

    what I don't understand is what side the enthalpy symbol goes on it changes and I don't know why

    for example 2O2 + CO ---> CO2 + O2

    assuming O2 has an enthalpy thingy of 20, CO is 30 and CO2 is -50

    the equation would then either be

    (20x2) + 30 + deltaH = -50 + 20
    (20x2) + 30 = deltaH -50 + 20

    how do I work out which side the deltaH goes on? my teacher said something about drawing lines without going against arrows and doing the longest one, I tried that and the longest line is always the same side and it don't make no sense

    Someone help

    It's not how many questions you ask, but the answers you get - Booms

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