Modelová Otázka ID 2754 - 
Kolik atomů vápníku obsahuje 1,5 molu síranu vápenatého?
Správná odpověď je: B
Počet molekul CaCO3 lze vypočítat jako součin látkového množství a Avogadrovy konstanty. Každá molekula CaCO3 obsahuje 1 atom vápníku, proto je počet atomů vápníku roven počtu molekul CaCO3. Výpočet provedeme následovně:
N(CaCO3) = n · NA = 1,5 · 6,022 · 1023 = 9,033 · 1023.
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