The percent relative abundance of Cu-63 is 69.15% and Cu-65 is 30.85%.
The atomic mass is the average mass of an element.
m(Cu) = 63.546 g; the average mass of copper
m(⁶³Cu) = 62.9296 g; average mass of copper-63 (Cu-63) isotope
m(⁶⁵Cu) = 64.9278 g; average mass of copper-65 (Cu-65) isotope
ω(⁶³Cu) = ?; average abundance of isotopes Cu-63
ω(⁶⁵Cu) = 1 - ω(⁶³Cu); average abundance of isotopes Cu-65
Ar(Cu) = ω(⁶³Cu) × m(⁶³Cu) + ω(⁶⁵Cu) × m(⁶⁵Cu)
63.546 g = ω(⁶³Cu) × 62.9296 g + (1 - ω(⁶³Cu)) × 64.9278 g
63.546 = 62.9296 × ω(⁶³Cu) + 64.9278 - 64.9278 × ω(⁶³Cu)
1.9982ω(⁶³Cu) = 1.3818
ω(⁶³Cu) = 1.4738 ÷ 1.9982
ω(⁶³Cu) = 0.6915 × 100%
ω(⁶³Cu) = 69.15%
ω(⁶⁵Cu) = 100% - 69.15%
ω(⁶⁵Cu) = 30.85%
More about relative abundance: brainly.com/question/19425232
#SPJ4
