Copper has two naturally occurring isotopes. Copper-63 has a percent abundance of 69.17% and copper-65 has a percent abundance of 30.83%. Based on this information calculate the average atomic mass of copper. *

The answer to your question is 63.62 g/mol

Explanation:

Data

Copper-63    abundance = 69.17 %

Copper-65    abundance = 30.83 %

Average atomic mass = ?

Formula

Average atomic mass = [Atomic mass of Copper-63 x abundance] +

                                       [Atomic mass of Copper-65 x abundance]

-Substitution

Average atomic mass = [63 x 69.17/100] + [65 x 30.83/100]

-Simplification

Average atomic mass = 43.58 + 20.04

-Result

Average atomic mass = 63.62 g/mol

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(iii)Radiometric dating methods

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(v)Lucy has a more humanoid pelvis because she was a hominin.

Explanation:

Hope it helps :)