Bromine has two naturally occurring isotopes (and ) and has an atomic mass of 79.904 . The mass of is 80.9163 , and its natural abundance is 49.31%.Calculate the mass of .Br-79 Express your answer using four significant figures. also Calculate the natural abundanc.

Bromine has two naturally occurring isotopes (and ) and has an atomic mass of 79.904 . The mass of first isotopes  is 80.9163 , and its natural abundance is 49.31%.Calculate the mass of .Br-79 Express your answer using four significant figures. also Calculate the natural abundanc.

the atomic mass of first isotopes       (M1)       =80.9163
the atomic mass of second isotopes (M2)        = ?

average atomic mass of  Bromine     (M )        = 79.904

C1 is the abundance % of first isotopes
abundance  % of second isotopes C2 = 100 - C1
                                                         = 100 - 49.31
                                                         = 50.69%  answer

average atomic mass  = (M1*C1+M2*C2)/100

plug the value in this formula we get

Bromine has two naturally occurring isotopes (and ) and has an atomic mass of 79.904 . The mass of is 80.9163 , and its natural abundance is 49.31%.Calculate the mass of .Br-79 Express your answer using four significant figures. also Calculate the natural abundanc.