Question

Calculate the average atomic mass of chlorine if it exists commonly in two isotopes,35/17 Cl (75%) and37/17 cl(25%).

Answer 1

Average atomic mass of Cl =
$\frac{35 \times 75 + 37 \times 25}{100}$
=
$\frac{2625 + 925}{100}$
=
$\frac{3550}{100}$
= 35.5 u

Answer 2

Given:

Mass of isotope 1 = 35amu

Mass of isotope 2 = 37 amu

% of isotope 1 = 75 = 0.75

% of isotope 2 = 25 = 0.25

To find:

Average atomic mass = ?

Formula to be used:

Average atomic mass = Mass× % of abundance

Calculation:

Average atomic mass two chlorine isotopes

= (35×0.75) + (37×0.25)

= 26.25+9.25  

= 35.50 amu.

Conclusion:

The average atomic mass of chlorine if it exists commonly in two isotopes 35/17 Cl (75%) and37/17 cl(25%) is 35.50amu.

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