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Earlier discussion
2 older comments kept for context.
Tomiwa Olatunde
That's for the relative abundance of 35
Ekedaye Michael Mitchell
Difference in Mass 35.5 - 35 = 0.5, therefore 37 - 35.5 = 1.5. therefore they exist in the ratio of 0.5 : 1.5. Sum up the ratio we have 0.5 + 1.5 = 2. Relative abundance is 0.5/2 x 100/1 = 25Ans