Given that rubidium has two isotopes, 85rb and 87rb. calculate the average atomic mass of rubidium.
note that 85rb has an atomic mass of 84.912 amu and occurs at an abundance of 72.17% while 87rb has an atomic mass of 86.909 amu and occurs at an abundance of 27.83%.

85.47 amu

Explanation:

the average atomic mass is calculated, with the atomic mass and the abundance of the element isotopes

To calculate the average atomic mass of Rb we do it with the following formula

gravity causes stares to cluster i think so

hurricanes form in warm water