Modelová Otázka ID 3674 - 
Jaká je hmotnost 1 atomu fluoru? Ar(F) = 19
Správná odpověď je: A
Výpočet provedeme následovně:
m = n · M = (N/NA) · M = [1/(6,022 · 1023)] · 19 = 3,16 · 10−23 g.
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