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2. Not quite. If i read it right you want them as a % of the total height of the two.
3. Oh , so it'd be 19/51 x 100 ? for the 191 one , + the other one.
4. It says it has only two isotopes, as shown on the graph. The y-axis scale says relative abundance. So for every 19 atoms of isotope a you have 31 atoms of isotope b. Since these are the only two isotopes just divide the relative abundance of each by the sum of the isotopes relative abundances abd multiply by 100 to obtain a percentage.

(19 / (19+31)) * 100 = 38
5. (Original post by Gelato)
Oh , so it'd be 19/51 x 100 ?
I read the abundances as 19 and 31, so the total would be 50. Otherwise this looks right.

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