Modelová Otázka ID 2823 - 
Kolik gramů chloridu sodného potřebujeme pro přípravu 400 ml roztoku o koncentraci c = 0,3 mol/l? Mr(NaCl) = 58,5
Správná odpověď je: A
Výpočet bude vypadat následovně:
m = c · V · M = 0,3 · 0,4 · 58,5 = 7,0 g.
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