1.

Boron has two isotopes boron-10 and boron-11 whose percentage abundanes are 19.6% and 80.4% respectively. What is the average atomic mass of boron?

Answer»

SOLUTION :Contribution of boron -10=`10.0xx0.196=1.96` AMU
Contribution of boron-11 `=11.0xx0.804=8.844` amu LTBR. ADDING both =1.96+8.844=10.804 amu


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