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Determinati masa de amoniac in care se gasesc 28g azot.

Răspuns :

NH₃ = amoniac
[tex]M_{NH_3} = 1 \cdot 14 + 3 \cdot 1 = 14 + 3 = 17 g/mol[/tex]

17 g NH₃ ____________ 14 g N
 x g NH₃ _____________ 28 g N
[tex]x = \frac{28 \cdot 17}{14} = 2 \cdot 17 = 34 g[/tex] NH₃