Modelová Otázka ID 3654 - 
Jaký je hmotnostní zlomek síry v thiosíranu sodném? Ar(Na) = 23; Ar(S) = 32
Správná odpověď je: B
Molární hmotnost Na2S2O3 je 158 g/mol. Výpočet provedeme následovně:
W = [2 · Ar(S)]/M(thiosíran) = (2 · 32)/158 = 0,41.
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