Question

Two main isotopes of nitrogen, N-14, atomic mass=14.003amu, with relative abundance=99.63%; and N-15, atomic mass=15.00 amu with relative abundance=0.37%. what is the atomic mass of nitrogen?

Answer 1

How about (0.9963)(14) + (0.0037)(15) ?

Answer 2

\[\frac{ 14.003*99.63+15*0.37 }{ 100 }\]
solve it.

Answer 3

douglaswinslowcooper i get 14.0037
and surjithayer i get 1395.17439

Answer 4

which one is the answer

Answer 5

I was wrong, used 14 instead of 14.003, which is needed, .

Correct answer (0.9963)(14.003) + (0.0037)(15.00)= 14.007.

You can see it must average a bit more than 14 because both isotopes are heavier than 14.

Answer 6

Thanks for medal. Glad to have helped.