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    (Original post by FailedMyMocks)
    Maths W/Finance or Computer Sci..

    cool
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    (Original post by p29)
    cool
    Anyway, Stay on top of your chemistry. It was the hardest A level I did and I even took Further Maths...

    Good Luck!
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    (Original post by FailedMyMocks)
    Anyway, Stay on top of your chemistry. It was the hardest A level I did and I even took Further Maths...

    Good Luck!
    im taking further maths aswell, fml
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    (Original post by p29)
    im taking further maths aswell, fml
    Woo!
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    This is all about moles, molar mass and mass of element. Something like that lool, just revise that!
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    (Original post by 1010marina)
    Kind of, but backwards:

    All the mass numbers on the periodic table are in relation to carbon 12. They're all relative numbers, which means, they're unitless - if carbon 12 weighs 12 x (x could be grams, kilograms, etc.) then your hydrogen atom will weigh only 1 x. It's a relationship.

    Avogadros number makes calculations using this fact easier. We measure in grams so we need a way of finding out how much 'stuff' is in a gram.
    By relation do you mean ratios?
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    A mole is literally a unit of measurement, like a kilogram or a metre.

    One mole of any element compound or substance always has a specific number of those particles. That specific number is a constant known as avogadros constant. 6.022 x 10 23

    A mole can have a different mass dependent on the element. Since relative atomic mass is the average weighted mass of a substance relative to 1/12 of the mass of carbon-12, a mole of carbon 12 weighs exactly 12 g and so we can deduce that the mass of a mole of a substance is round about the same number of grams as its relative molecular mass.
 
 
 
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