Металический цвет серый стальной
NaMnO4
HMnO4 - марганцовая кислота, возможно
Ca(NO₃)₂ + K₂CrO₄ = CaCrO₄ + 2KNO₃
Ca²⁺ + 2NO₃⁻ + 2K⁺ + CrO₄²⁻ = Ca²⁺ + CrO₄²⁻+ 2K⁺ + 2NO₃⁻
не идет
а-2
Ca +2 NaOH=Ca(OH)2+2Na
<span>Ca + 2H2O=Ca(OH)2 +H2</span>
<span>2Ca+O2=2CaOб</span>
б-3
<span><span>KOH +NH4Cl=KCl+NH3+H2O</span></span>
<span><span><span>6KOH +P2O5=2K3PO4+3H2O</span></span></span>
<span><span><span><span>2KOH +CrO3=<span>K2CrO3+Н2O</span></span></span></span></span>
<span><span><span><span><span>в-2</span></span></span></span></span>
<span><span><span><span><span><span>SO2 +2NaOH=Na2SO3+H2O</span></span></span></span></span></span>
<span><span><span><span><span><span><span>SO2 +H2O=H2SO3</span></span></span></span></span></span></span>
<span>SO2 +O2=2SO3</span>
<span>г-5</span>
<span><span><span> ZnS + O2 = Zn+SO2</span></span></span>
<span><span><span><span> ZnS +2HСl=ZnСl2+H2S(газ)</span></span></span></span>
<span><span><span><span><span> ZnS + 2HNO3=Zn(NO3)2+H2S(газ)</span></span></span></span></span>
2,4 г Х г
2 Mg + O2 = 2MgO
n = 2 моль n = 2 моль
Mr = 24 г/моль Mr = 40 г/моль
m = 48 г m = 80 г
2,4 г Mg - Х г MgO
48 г Mg - 80 г MgO
m(MgO) = 2,4 * 80 / 48 = 4 г