Question

2. Copper has two isotopes, 63Cu and 65Cu. The relative atomic mass of copper is 63.5.
Find the relative percentage abundance of the two isotopes of copper.
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Answer 1

Answer:

percentage of 63Cu=75%, percentage of 65Cu=25%,

Explanation:

Suppose, percentage of 63Cu=x, percentage of 65Cu=(100-x)

so,

((63×x)+(65×(100-x)))/100= 63.5

or, ((63×x)+(65×(100-x)))=6350

or, 63x-65x=6350-6500

or, 2x=150

so, x=75

so, percentage of 63Cu=75%, percentage of 65Cu=(100-75)%=25%