CaO -> CaCO3 -> Ca(HCO3)2 -> CaCl2
1) CaO + CO2 = CaCO3
2) CaCO3 + H2CO3 = Ca(HCO3)2
3) Ca(HCO3)2 + 2HCl = CaCl2 + 2H2O + 2CO2
![2HCO_{3}^{-} + 2H^{+} = 2H_{2}O + 2CO_{2}](https://tex.z-dn.net/?f=2HCO_%7B3%7D%5E%7B-%7D+%2B+2H%5E%7B%2B%7D+%3D+2H_%7B2%7DO+%2B+2CO_%7B2%7D)
<span>2Pb(NO3)2= 2PbO +4NO2 +O2</span>
SO2+NaOH(щелочь)=Na2SO3+H2O
SO2+NaOH = NaHSO3
SO3+KOH=K2SO4+H2O
SO3+KOH=KHSO4
Средный
x=9.2+9.3+9.2+9.0+9.6+9.5+9.3+9.0+9.3+9.1/10=9.25
Al(3+) + N2(3-)
2Al + N2 = 2AlN