10HNO3 (разб.) + 4Mg = 4Mg(NO3)2 + N2O + 5H2O
Mg0-2e=Mg2+|2
N5+ +4e=N+ |1
<span>SiO2 + 2 Mg = 2 MgO + Si</span>
<span>а)Ba(OH)2+HCI=>BaCl(+)+H(OH)2(-)
</span><span>б)K2S+H2SO4=>K2SO4(0)+ H2S(0)
</span><span>в)BaCI2+MgSO4=>BaSO4(0)+MgCl2(0)
</span><span>г)NaNO3+MgCI2=>NaCl2(-)+MgNO3(+)
</span><span>д)AgNO3+AICI3=>AgCl3(2-)+AlNO3(2+)
</span><span>е)CaCO3+HCI=>CaCl(+)+HCO3(-)
</span><span>ж)Cu(OH)2+H2SO4=>CuSO4(0)+H2(OH)2(0)
</span><span>з)FeCI2+NaOH =>FeOH(+)+NaCl2(-)</span>
KCl, PbSO4, NaF, NaS, Mg3(PO4)2, ZnCl2, Al(NO3)3
K3PO4 = 3K(+) + PO4(3-) (1+, 3-)
Na2SO4 = 2Na(+) + SO4(2-) ( 1+, 2-)
MgSO4 = Mg(2+) + SO4(2-) ( 2+,2-)
CaCl2 =Ca(2+) + 2Cl(-) (2+,1-)
2NA+S-->NA2S
8g(S)/32g/m=0,25m
m(NA2S)=0,25*78=19,5