Question

What is the percentage abundance of the isotopes of nitrogen 14 and 15?

Answer 1

Answer:

N14 is about 99.6 percent. and remain N15

Answer 2

Answer:

The percentage abundance of N-14 is 99.3% and of N-15 is 0.7%.

Explanation:

Here's the solution:

(14.003074) (x) + (15.000108) (1 − x) = 14.007

Notice that the abundance of N-14 is assigned 'x' and the N-15 is 'one minus x.' The two abundances always add up to one (or, if you prefer, 100%)

For example, I might have this:

(14) (x) + (15) (1 − x) = 14.007

Solving gives:

14x + 15 − 15x = 14.007

After some more simple algebra, we get:

x = 15 − 14.007 = 0.993

so

1 − x = 0.007