On the planet Invertios, boron has two isotopes as follows: Isotope Mass (amu) Natural Abundance (%)
Boron-10 10.0129 80.00
Boron-11 11.0093 20.00
Estimate the relative atomic mass of boron on Invertios.

Question

Quizplus · Accepted Answer

To calculate the relative atomic mass of boron on Invertios, we need to use the formula:

Relative atomic mass = (isotope mass x natural abundance/100) + (isotope mass x natural abundance/100)

Plugging in the values for boron-10 and boron-11 on Invertios, we get:

Relative atomic mass = (10.0129 amu x 80.00/100) + (11.0093 amu x 20.00/100)
Relative atomic mass = 8.0103 amu + 2.2019 amu
Relative atomic mass = 10.2122 amu

Rounding off to one decimal place, the answer is 10.2 amu, which is choice B.

On the Planet Invertios, Boron Has Two Isotopes as Follows