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AP Chemistry
1.2 Mass Spectra of Elements
AdvancedMCQGraphicalConceptual23.3k
A grayscale mass spectrum graph with bare axes and no gridlines. The horizontal axis is labeled m/z and spans from 70 to 170 with marked integer ticks at 79, 81, 158, 160, and 162. The vertical axis is labeled Relative Intensity (%) with tick marks at 0, 50, and 100. Five distinct vertical black lines representing mass spectrum peaks are present. In the low mass region, two peaks of equal height at 50% intensity appear at m/z = 79 and m/z = 81. In the high mass region, three peaks appear: one peak at m/z = 158 with 50% intensity, one peak at m/z = 160 with 100% intensity, and one peak at m/z = 162 with 50% intensity. No other peaks, curves, gridlines, labels, or annotations appear.
Mass spectrum of \(\text{Br}_2\text{(g)}\) showing atomic fragment ions and molecular ions.
A sample of pure gaseous bromine, \(\text{Br}_2\text{(g)}\), is analyzed in a mass spectrometer. The ionization chamber produces both singly charged monatomic fragment ions, \(\text{Br}^+\), and intact molecular ions, \(\text{Br}_2^+\), yielding the mass spectrum shown below.

Based on the mass spectrum, which of the following best explains why the peak at \(m/z = 160\) is approximately twice as intense as the peaks at \(m/z = 158\) and \(m/z = 162\)?

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