Chemistry - Mole Concept Question with Solution | TestHub

The mole fractional abundance of ${\mathrm{B}}^{10}$ in a natural sample of B oron is 0.2 . If the natural sample contains only ${\mathrm{B}}^{10}$ (Atomic Mass $=10.2$ ) and ${\mathrm{B}}^{11}$ (Atomic Mass $=11.1$ ) atoms, the average atomic mass of Boron is: