Question

boron has two naturally occurring isotopes: boron-10 (abundance 19.8%, mass 10.013 amu), boron-11 (abundance 80.2%, mass 11.009 amu). calculate the atomic mass of boron.

Answer 1

Atomic mass of Boron: 10.8 amu

Step-by-step explanation:

Boron-10: (0.198)(10.013) = 1.98 amu

Boron-11: (0.802)(11.009) = 8.83 amu

Add them up: 1.98+8.83= 10.8 amu