An element has the following natural abundances and isotopic masses:92% abundance with 19.99 amu, 0.26% abundance with 20.99 amu, and 8.82% abundance…

An element has the following natural abundances and isotopic masses: 90.92% abundance with 19.99 amu, 0.26% abundance with 20.99 amu, and 8.82% abundance with 21.99 amu. Calculate the average atomic mass of this element.