1) Use the References to access important values if needed for this question. 1
ID: 1047420 • Letter: 1
Question
1) Use the References to access important values if needed for this question. 1 pt 1req The element bromine has an atomic weight of 79.9 and consists of two stable isotopes bromine-79 and bromine-81. The isotope bromine-79 has a mass of 78.9 amu and a percent natural abundance of 50.5 %. The isotope bromine-81 has a percent natural abundance of 49.5 %. ons 1 pt ons 1 pt req What is the mass of bromine-81? amu 1 pt 1re 1 pt 1req Retry Entire Group 9 more group attempts remaining e 1 pt 1req 1 pt 1 ptMExplanation / Answer
Let the mass of Bromine-81 be x
Element Bromine mass = 79.9 amu
Percentage abundance of isotope Br-79 * Mass of iostopte Br-79 + Percentage abundance of isotope Br-81 * Mass of iostopte Br-81 = 79.9
50.5/100 * 78.9 + x * 49.5/100 = 79.9
x * 49.5/100 = 40.0555
x = 80.920 amu
If the above doesn't work, then try entering 80.9 which is the value with only one decimal place
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