Mass Spectroscopy of Elements

AP Chemistry· difficulty 3/5

A mass spectrum shows two peaks for an element at m/z = 20 (90%) and m/z = 22 (10%). The average atomic mass is approximately

A
$21.0$
B
$20$
C
$22$
D
$20.2$
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Explanation

0.90 \times 20 + 0.10 \times 22 = 18 + 2.2 = 20.2

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