The element copper (cu) has two naturally occurring isotopes, 63cu and 65cu, with an average atomic mass of 63.55 u. copper is 69.17% 63cu, and the atomic mass of 63cu is 62.9296 u. calculate the mass of 65cu (in u).

The mass of 65Cu is 64.9419 u

Explanation:

Step 1: Data given

Copper has 2 naturally occurring isotopes, 63Cu and 65Cu, with an average atomic mass of 63.55 u.

⇒ 63Cu = 69.17 % = 62.9296 u

Step 2: Calculate mass of 65Cu

100 % 69.17% = 30.83%

63.55u = 0.6917*62.9296 + 0.3083X

X = 64.9419u

The mass of 65Cu is 64.9419 u

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