Modelová Otázka ID 3663 - 
Při reakci zinku s nadbytkem kyseliny chlorovodíkové vzniklo 20 l vodíku. Kolik gramů zinku reagovalo? Ar(Zn) = 65
Správná odpověď je: C
Rovnice reakce zinku s kyselinou chlorovodíkovou vypadá takto:
Zn + 2 HCl → ZnCl2 + H2.
Výpočet provedeme následovně:
n(H2) = V/Vid = n(Zn)
m(Zn) = n(Zn) · M(Zn) = (V · M)/Vid
m(Zn) = (20 · 65)/22,414 = 58 g.
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