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In: Chemistry

Gallium has two isotopes, 69Ga and 71Ga; 60.11 % of gallium is 69Ga and 39.89 %...

Gallium has two isotopes, 69Ga and 71Ga; 60.11 % of gallium is 69Ga and 39.89 % is 71Ga. The atomic mass of 69Ga is 68.926 amu and the atomic mass of 71Ga is 70.925 amu . What is the atomic weight of gallium?

Solutions

Expert Solution

Ans. Average atomic weight of Ga = (% 69Ga x its atomic mass) + (% 71Ga x its atomic mass)

                                                = (60.11 % x 68.926 amu) + (39.89 % x 70.925)

                                                = 41.4314186 amu + 28.2919825 amu

                                                = 69.7234 amu


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