TBQ - Calculation of average atomic mass — task. Science CBSE, Class 9 New.

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Give the average atomic mass of an element from its isotopes:

If lithium atom is available in the form of, say, two isotopes, $_{3}\textrm{Li}^{6}$ ($7.5$%) and $_{3}\textrm{Li}^{7}$ ($92.5$%), calculate the average atomic mass of lithium.

i. What is the formula to determine tha average atomic mass?

\frac{\sum (Mass of isotopes \times % Natural abundance)}{100}

\frac{\sum (Mass of isotopes \times 100)}{% Natural abundance}

\frac{(% Natureal abundance \times 100)}{\sum (Mass of isotopes)}

d. $\frac{\sum (Mass of isotopes)}{100}$

ii. When substituting the given values in the formula, we get,

$6.925 u$
$7.253 u$
$5.925 u$
$8.752 u$

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11. TBQ - Calculation of average atomic mass

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