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# Silly little question watch

1. Hmm.... how do you convert kJ/mol to kJ/g?
2. 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 )
3. (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?
4. (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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