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

Answer:

Atomic mass of Gallium is 69.7230 amu

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-

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

= $\frac{(60.11\times 68.9256 amu)+(39.89\times 70.9247 amu)}{100}$

= 69.7230 amu