# Question #fe104

Nov 1, 2017

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:
$1.06632 \times x = 15.9949$

Now you just rearrange to calculate $x$:
$\frac{15.9949}{1.06632} = x$

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

Hope that helps