14 please Copper has an atomic weight of 63.55 u. If 69.17% of Cu exists as Cu-6

Question

14 please

Copper has an atomic weight of 63.55 u. If 69.17% of Cu exists as Cu-63 (62 93960 u). what is the identity and the atomic mass of the other isotope? Cu-64, 63.82 u Cu-64, 64.16 u Cu-65; 64.16 u Cu-66. 65.91 u Cu-65; 64.92 u Which of the following statements is true concerning the electron configuration [Kr]5p^2? This configuration cannot be the ground-state electron configuration for a Sr atom because it violates the Heisenberg uncertainty principle. This configuration is the ground-state electron configuration for a Sr atom. This configuration cannot be the ground-state electron configuration for a Sr atom because it violates the Aufbau principle. This configuration cannot be the ground-state electron configuration for a Sr atom because it violates Hund's rule. Thus configuration cannot be the ground state electron configuration for a Sr atom because it violates the Pauli exclusion principle. Density is an example of a(n) _______ property, which is one that does not depend on the amount of a substance.

Explanation / Answer

Total mass = sum of the masses of the isotopes

63.55 = ( (69.17/100)x62.93960) + (((100-69.17)/100)xM))

M = 64.92 u of Cu-66

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Option (c) is correct

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