Modelová Otázka ID 3685 - 
Reakcí hliníku s chlorovodíkem vzniká chlorid hlinitý a vodík. Kolik gramů chlorovodíku potřebujeme k přípravě 58 gramů chloridu hlinitého? Ar(Al) = 27; Ar(Cl) = 35,5
Správná odpověď je: A
Rovnice reakce hliníku s chlorovodíkem vypadá takto:
2 Al + 6 HCl → 2 AlCl3 + 3 H2.
Výpočet provedeme následovně:
n(AlCl3) = m(AlCl3)/M(AlCl3)
n(HCl) = 3 · n(AlCl3) = [3 · m(AlCl3)]/M(AlCl3)
m(HCl) = n(HCl) · M(HCl) = [3 · m(AlCl3) · M(HCl)]/M(AlCl3)
m(HCl) = (3 · 58 · 36,5)/133,5 = 47,6 g.
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