1) Zn + FeCl2 = Fe + ZnCl2;
2) Fe + 4HNO3 (разб.) = Fe(NO3)3 + NO + 2H2O;
3) 2Fe(NO3)3 = Fe2O3 + 6NO2 + 1.5O2;
4) 6NO2 + 1.5O2 + 6NaOH = 6NaNO3 + 3H2O.
Ag +2HNO3к<span> = AgNO</span>3<span> + NO</span>2<span> + H</span>2<span>O
</span>3Ag + 4HNO3р-р<span> = 3AgNO</span>3<span> + NO + 2H</span>2<span>O
</span>Hg + 4HNO3к<span> = Hg(NO</span>3)2<span> + 2NO</span>2<span> + 2H</span>2<span>O</span>
C2H6 + HCl=C2H5Cl +H2
C2H5Cl + KOH=C2H5OH +KCl
1. Ca⁰+H₂¹⁺SO₄⇒ Ca²⁺SO₄+H₂⁰↑
2. C⁰+2H₂S⁶⁻O₄⇒ 2S⁴⁺O₂↑+C⁴⁺O₂↑+2H₂O
2Al + Fe2О3 = Al2О3 + 2Fe
\|(Fe2O3)=80/160=0,5 моль
\|(Fe)=2\|(Fe2O3)=2*0,5=1 моль
m(Fe)=1*56=56 грамм
56----100%
48-----х%
х=48*100/56
х=85,7 %