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# Chem questions maths watch

1. Help pls on number 6.
3. (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?
4. yeah
5. (Original post by ra1500)
yeah
9 + 6 + 1 = 16.

The abundance of the first one is 9/16 x 100 %
6. but you know for the second part of question 6, could you kindly give me a worked out solution?
7. 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?
8. Its AS year of alevel chemistry x

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