AP Chemistry Directions
1:04:50
Hide
Annotate Reference
Help
More
Spectrum A
Spectrum B
7
100
80
100
80
60
40
2011
60
40
20
0
Which of the spectra shown could represent the isotopic composition of an
unknown element that has an average atomic mass of 25.5 amu?
0
22 23 24 25 26 27
22 23 24 25 26 27
A Spectrum A
Relative Abundance (%) Relative Abundance (%)
Atomic Mass (amu)
Relative Abundance (%) Relative Abundance (%)
Atomic Mass (amu)
Spectrum C
100-
80
® Spectrum B
60
Spectrum D
100
80
60
40
20
01
22 23 24 25 26 27
© Spectrum C
40
20
0
II
22 23 24 25 26 27
D Spectrum D
Atomic Mass (amu)
Atomic Mass (amu)