How would you calculate the average atomic mass of copper if 69.2% of copper has a mass of 62.93 amu and 30.8% has a mass of 64.93 amu?

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Solution

Average atomic mass:
The Average atomic mass of an element can be calculated by adding up the masses of its isotopes, which are each multiplied by its natural abundance.
For calculating the average atomic mass of Copper, the natural abundance of its isotopes is given as follows;
$69.2 % of 62.93 amu for {}^{63}{Cu} 30.8 % of 64.93 amu fo {}^{65}{Cu}$
Hence the average atomic mass can be calculated as;
$= (0.692 x 62.93) + (0.308 x 64.93) = 63.546 amu$
Therefore, in the above-given way, as described, the average atomic mass of Copper can be calculated as $63.546 amu$

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