AP Chemistry· difficulty 3/5
A pure sample of element X has a mass spectrum with peaks at m/z = 35 (75.77%) and m/z = 37 (24.23%).
The average atomic mass of X (and its identity) is:
35.00 amu, chlorine
36.00 amu, chlorine
37.00 amu, argon
35.48 amu, chlorine
Explanation
(35)(0.7577) + (37)(0.2423) = 35.48 amu, matching chlorine.
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