Respuesta :
Answer:
mass 65Cu = 19.59 u
Explanation:
∴ atomic mass Cu = 63.55 u
∴ atomic mass 63Cu = 62.9296 u
∴ 69.17% 63Cu = (mass 63Cu / mass Cu)×100
⇒ 0.6917 = mass 63Cu / mass Cu
⇒ mass 63Cu = (63.55)(0.6917) = 43.958 u
∴ mass Cu = mass 63Cu + mass 65Cu
⇒ 63.55 u = 43.958 u + mass 65Cu
⇒ mass 65Cu = 63.55 u - 43.958 u
⇒ mass 65Cu = 19.59 u
Answer:
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
