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  • Message 1. 

    Posted by U15228749 (U15228749) on Tuesday, 28th May 2013

    how would i do this one pls? smiley - smiley

    A one carat diamond used in a ring contained
    1 X 10 ^22 carbon atoms.
    What is the approximate mass of the diamond?

    A) 0.1g
    B) 0.2g
    C) 1.0 g
    D) 1.2 g

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  • Message 2

    , in reply to message 1.

    Posted by MissChemTeacher_Bitesize (U15172316) on Tuesday, 28th May 2013

    Hey There!

    You need to use Avogadro’s constant to work this out.

    So, one mole of carbon (12g) contains Avogadro’s number of atoms 6.02 x 10 atoms .

    You need to use proportion to calculate the mass of carbon if there are 1x10 atoms.

    6.02 x 10 atoms -------------> 12g of carbon
    1x10 atoms ------------------> xg of carbon

    Mass of carbon in x = 1x10 x 12g / 6.02 x 10
    Mass of carbon in x = 0.2g

    Hope this helps.

    Miss_Chem smiley - cool

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