Question

Gallium has two naturally occurring isotopes, 696a (isotopic mass 68.9256 amu, abundance 60.11%) and 716a (isotopic mass 70.9247 amu, abundance 39.89%). Calculate the atomic mass of gallium

Answer 1

Atomic mass of Gallium is 69.7230 amu

Step-by-step explanation:

100 atoms of gallium contains 60.11 number of
`^(69)\textrm{Ga}` atoms and 39.89 number of
`^(71)\textrm{Ga}` atoms.

Therefore atomic mass of gallium is given by-

`\frac{(60.11* atomic mass of ^(69)\textrm{Ga})+(39.89* atomic mass of ^(71)\textrm{Ga})}{100}`

=
`((60.11* 68.9256 amu)+(39.89* 70.9247 amu))/(100)`

= 69.7230 amu