Question

Question #fe104

Answer 1

Divide the oxygen-16 mass by 1.06632

Explanation:

It may be helpful to look at this algebraically.

Let the mass of nitrogen-15 `= x`

As the mass of nitrogen -15 is 1.06632 times bigger than the mass of oxygen-16:
`1.06632 xx x = 15.9949`

Now you just rearrange to calculate `x`:
`15.9949/1.06632 = x`

So the mass of nitrogen-15 is:
`x = 15.0001`

Hope that helps