1.9    Calculate the atomic mass (average) of chlorine using the following data:    

                            % Natural Abundance                 Molar Mass
35Cl                                    75.77                                      34.9689
37Cl                                    24.23                                      36.9659

Answers (1)
D Divya Prakash Singh

To calculate the average atomic mass of chlorine:

Given the fractional natural abundance of _{}^{35}\textrm{Cl} with 34.9689\ u molar mass is 75.77\% and that of  _{}^{37}\textrm{Cl} with 36.9659\ u molar mass is 24.23\%.

Therefore we have,

Average Atomic mass of Chlorine:

= \left ( 0.7577\times34.9689\ u \right ) + \left ( 0.2423\times36.9659\ u \right )

= 26.4959\ u + 8.9568\ u = 35.4527\ u

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