urgent answer
question number 35
b part
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average atomic mass=(%age of isotope1×atomicmass of isotope1+...........%age of isotope n ×atomicmass of isotope n )/ 100
so Here.....
average atomic mass of Br is (79×49.7+81×50.3)/100= 80.006
so Here.....
average atomic mass of Br is (79×49.7+81×50.3)/100= 80.006
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