AP Chemistry· difficulty 4/5
A mass spectrum of pure element Y shows three peaks: m/z = 24 (78.99%), 25 (10.00%), 26 (11.01%).
Identify element Y based on its average atomic mass.
Magnesium (24.32 amu)
Aluminum (26.98 amu)
Calcium (40.08 amu)
Sodium (22.99 amu)
Explanation
Avg = (24)(0.7899) + (25)(0.1000) + (26)(0.1101) = 18.96 + 2.50 + 2.86 = 24.32 amu. Magnesium.
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