The table below gives the data that is needed to calculate the average atomic mass of element B. Isotope Atomic mass (amu) Relative abundance (%) B-10 10.01 19.91 B-11 11.01 80.09 Based on these data, what is the average atomic mass of element B? 10.01 10.51 10.81 11.01

The average atomic mass = (10.01 * 19.91) + (11.01 * 80.09)

= 1.99 + 8.817 = 10.81

Therefore; the average atomic mass is 10.81.

From the table below;

Element B has two isotopes; One with a mass of 10.01 and a relative abundance of 19,91, while the other has a mass of 11.01 and a relative abundance of 80.09.

The average atomic mass = (10.01 * 19.91) + (11.01 * 80.09)

= 1.99 + 8.817 = 10.81

Therefore; the average atomic mass is 10.81.