Modelová Otázka ID 2750 - 
Jaká je hmotnost dusičnanu amonného, který obsahuje právě 18 g dusíku? Ar(N) = 14
Správná odpověď je: D
Molární hmotnost NH4NO3 je 80 g/mol. 1 mol NH4NO3 obsahuje 2 moly dusíku, proto je nutné vypočítané látkové množství dusíku vydělit dvěma. Výpočet provedeme následovně:
m(dusičnan) = {[m(N)/M(N)] /2} · M(dusičnan)
m(dusičnan) = [(18/14)/2] · 80 = 51,4 g.
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