Question

28. An element X has two isotopes 52X and 54X. If
percentage abundance of lighter isotope is 60% then
the average atomic mass of the element X will be
(1) 53.4
(2) 52.4
(3) 52.8
(4) 53.2​

Answer 1

Answer:

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Explanation:

Answer 2

Answer:

The correct answer is Option C : $52.8$

Explanation:

Given that :

The abundance of the lighter isotope is $60$%.

i.e. the percentage abundance of $_{52}X$ is $60$%

Then, the percentage abundance of $_{54}X$ will be $40$%

To find the average atomic mass :

Let's multiply the masses of the given isotopes with their percentages.

$(52*0.6)+(54*0.4)=52.8$

Hence, the average atomic mass of the element $X$ is $52.8$