Question

Using the atomic masses and relative abundance of the isotopes of nitrogen given below, determine the average atomic mass of nitrogen.

N-14: 14.003 amu; 99.63%
N-15: 15.000 amu; 0.37%

A)14.003 amu

B)14.007 amu

C)14.506 amu

D)15.000 amu

Answer 1

amm= (%×mass1 +%×mass2)/100 just put the known values (99.63×14.003+0.37×15)/100 =14.007