Modelová Otázka ID 2759 - 
Jaká je hmotnost 1,205 · 1024 molekul kyslíku?
Správná odpověď je: D
Z počtu částic vypočítáme látkové množství, z látkového množství a molární hmotnosti kyslíku vypočítáme hmotnost. Je nutné dosadit molární hmotnost molekul kyslíku O2, tedy 32 g/mol. Výpočet provedeme následovně:
m = n · M = (N/NA) · M = [(1,205 · 1024)/(6,022 · 1023)] · 32 = 64,0 g.
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