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Answer:Option B) 63.55 amu
Explanation:To find the average atomic weight of the two isotopes of copper that exist in nature we can use the below formula;
Average atomic mass = ∑ (isotope(s) x abundance)
Therefore, we have the given values of atomic masses of two copper isotopes are 62.93 u and 64.93 u, respectively. They have natural abundance as 0.692 and 0.368, respectively,
On substituting the above values, we get,
Average atomic mass = (62.93 x 0.692) isotope 1 of Cu + (64.93 x 0.308) isotope 2 of Cu
Average atomic mass = 43.54 + 19.99 = 63.538 ~ 63.55
Therefore, the average atomic mass of Cu will be 63.55 amu.
