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    Hmm.... how do you convert kJ/mol to kJ/g?
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    do you have the molecular mass of whatever you're using? if you do you can just convert it using the n=m/M formula (I think that's it... hmm... I should know that )
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    (Original post by Natalie Lane)
    do you have the molecular mass of whatever you're using? if you do you can just convert it using the n=m/M formula (I think that's it... hmm... I should know that )
    so is it therefore n x M,
    i.e moles x molar mass?
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    (Original post by Loopz)
    so is it therefore n x M,
    i.e moles x molar mass?
    Yeah. You have the value for one mole.
    One mole of a substance has the mass of whatever it's molar mass is, eg for C-12 this is 12gmol-1
    So, hypoethetically, the combustion of water (I'm making this value up for example purposes!):

    648mol-1
    1 mole has mass 18g
    so 648J per 18g
    Divide this all by 18
    36J per g
 
 
 
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