Modelová Otázka ID 2825 - 
Kolik mmol NaOH obsahuje 600 ml jeho roztoku o hmotnostní koncentraci 50 g/dm3? Ar(Na) = 23
Správná odpověď je: A
Molární hmotnost NaOH je 40 g/mol. Výpočet bude vypadat následovně:
m(NaOH) = ρ · V = 50 · 0,6 = 30 g
n(NaOH) = m/M = 30/40 = 0,75 mol = 750 mmol.
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