CHEMISTRY · Single correct · A Level · Chemistry · Atomic structure · Atomic structure
Problem
Two samples of magnesium, labeled Spectrum X and Spectrum Y, were analyzed by mass spectrometry. The relative intensities of the singly charged peaks are shown.
Spectrum X: 78.8 % at m/z = 24, 10.1 % at m/z = 25, 11.1 % at m/z = 26
Spectrum Y: 62.0 % at m/z = 24, 28.8 % at m/z = 25, 9.2 % at m/z = 26
Which conclusion about the isotopic composition of Spectrum Y is most consistent with the data?
(a) Spectrum Y is enriched in 24Mg.
(b) Spectrum Y matches the natural isotopic distribution.
(c) Spectrum Y is enriched in 25Mg.
(d) Spectrum Y is enriched in 26Mg.