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    Help pls on number 6.
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    (Original post by ra1500)
    Help pls on number 6.
    Can you do all the other ones?

    Is it just the 9 to 6 to 1 that you're struggling with?
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    yeah
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    (Original post by ra1500)
    yeah
    9 + 6 + 1 = 16.

    The abundance of the first one is 9/16 x 100 %
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    but you know for the second part of question 6, could you kindly give me a worked out solution?
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    I got 33.3 for the average relative mass: I'm not entirely sure if that's correct though.


    EDIT: I think the second part is:

    (75 x 35) + (25 x 37) /100= 35.5

    Just to reiterate; I'm not sure if I'm correct.

    Just a quick question; is this GCSE work? If so, Year 10 or Year 11?
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    Its AS year of alevel chemistry x
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