Modelová Otázka ID 3688 - 
Kolik molů draselných iontů obsahuje roztok vzniklý rozpuštěním 35 gramů chloridu draselného ve vodě? Ar(K) = 39; Ar(Cl) = 35,5
Správná odpověď je: B
Látkové množství draselných iontů je stejné jako látkové množství původního chloridu draselného (z 1 molekuly KCl vznikne 1 iont K+). Výpočet provedeme následovně:
n = m(KCl)/M(KCl) = 35/74,5 = 0,47 mol.
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