Naturally occurring copper consists of copper cu63 and cu65 in the ratio 8:3. calculate the average atomic mass of copper.
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The Correct Answer is 63.546
Explanation:
The atomic mass of Cu63is 62.93 and relative abundance = 69.2%
The atomic mass of Cu65is 64.93 and relative abundance = 30.8%
Formula
The average atomic mass of an element is calculated by taking the weighted average of the atomic masses of its naturally-occurring isotopes.
avg. atomic mass
=∑ i (isotope i×abundancei)
The atomic masses of these two copper isotopes are 62.93 uand 64.93 u , respectively.
Therefore, relative atomic mass of Cu = (62.93×69.2)+(64.93×30.8) / 100
=63.546
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