the ratio of isotopic abundance of two isotopes of an element is 3:2 and their most number of 69 and 71 respectively. calculate the average atomic mass of the element.
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As ratio of isotopic abundance is 3:2
So 3/2=x/100-x
So x=60and 100-x =40
Av atomic mass=69*x+71*(100-x)/100
=4140+2840/100
=6980/100
=69.80u
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