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The avarage atomic mass of a smple of an element x is 16.2u what are the percentage of Isotope ¹⁶x₈ , ¹⁸x₆ in the sample

Posted by Srinath R 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Naveen Sharma 7 years, 2 months ago

Ans.

1Thank You

Shweta Gulati 7 years, 2 months ago

Suppose percentage of isotope ¹⁶₈X = x

Then, percentage of isotope ¹⁸₈X = (100-x)

Average atomic mass = $\frac{16 * x + 18 * (100 - x)}{100}$ = $\frac{1800 - 2 x}{100}$

= 18-0.02x

So, 18-0.02x= 16.2 (Given)

0.02x=1.8

x= 90

So percentage of isotope ¹⁶₈X = 90 %

Then, percentage of isotope ¹⁸₈X = (100-90)

= 10%

1Thank You

ANSWER

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