Question

Calculate the atomic mass of naturally occurring molybdenum (Mo) which
contains the following isotopes.
Isotope Abundance (%) Atomic mass (a.u.)
92Mo 15.8 91.91
94Mo 9.0 93.90
95Mo 15.7 94.91
96Mo 16.5 95.91
97Mo 9.5 96.91
98Mo 23.5 97.91
100Mo 9.7 99.91

Answer 1

Too much typing. Do this
(%)(au) + (%)(au) + (%)(au) ........ = au
(0.158*91.91) + (0.009*93.90) + ..... = au.