Element X consists of two isotopes with masses of 62.9 and 64.9.

The relative atomic mass of the element is 63.6. The percentage

abundance of the lighter isotope is closest to -

Select one:

-65%

-55%

-35%

-45%

Question

Jeffrey Deleon

Chemistry

5 December, 04:48

Element X consists of two isotopes with masses of 62.9 and 64.9.

The relative atomic mass of the element is 63.6. The percentage

abundance of the lighter isotope is closest to -

Select one:

-65%

-55%

-35%

-45%

+5

Answers (1)

Know the Answer?

Gillian Irwin · Answer 1

65%.

Explanation:

If the abundance of the lighter isotope is x then the abundance of the heavier isotope is 1-x. So:

62.9x + 64.9 (1 - x) = 63.6

62.9x - 64.9x = 63.6 - 64.9

-2x = - 1.3

x = 0.65 or 65%.

Element X consists of two isotopes with masses of 62.9 and 64.9.The relative atomic mass of the element is 63.6. The percentageabundance of the lighter isotope is closest to -Select one:-65%-55%-35%-45%

Element X consists of two isotopes with masses of 62.9 and 64.9.

The relative atomic mass of the element is 63.6. The percentage

abundance of the lighter isotope is closest to -

Select one:

-65%

-55%

-35%

-45%