Natural Abundance?

1 ⤊

Bromine has two naturally occurring isotopes ( Br-79 and Br-81) and has an atomic mass of 79.904 amu . The mass of Br-81 is 80.9163 amu, and its natural abundance is 49.31%. Calculate the mass of Br-79? how do you find the mass.

2007-09-19 05:12:34 · 1 answers · asked by Chuck 1 in Science & Mathematics ➔ Chemistry

1 answers

Two naturally occurring isotopes are responsible for the making the atomic mass 79.904

The abundance of Br-81 is 49.31%. The abundance of Br-79 is 100% - 49.31% or 50.69%.

49.31% * 80.163 (mass of Br-81) + 50.69% * mass of Br-79 = 79.904. Solve for mass of Br-79.

How is Chem 101, anyway?

2007-09-19 08:55:20 · answer #1 · answered by Rush is a band 7 · 1⤊ 0⤋