<span>Fe2O3->Fe->FeSO4->FeOH2->FeCl2
1)fe2o3+2c=2fe+3co
2)fe+h2so4(разбавленная)=feso4+h2
3)feso4+2naoh=fe(oh)2(осадок)+na2so4
4)fe(oh)2+2hcl=fecl2+2h2o</span>
Х³+25=150,
х³=150-25,
х³=125,
х=5.
Ответ: 5
2)ZnO + SiO2 = ZnSiO3 BeO + Cl2O7 = Be(ClO4)2
SnO + Cl2O7 = Sn(ClO4)2 Al2O3 + 3N2O5 = 2Al(NO3)3
Cr2O3 + P2O5 = 2CrPO4 Fe2O3 + 3SO3 = Fe2(SO4)3
3) K2O +
BeO = K2BeO2 BaO + Cr2O3
= Ba(CrO2)2
Cs2O +
Al2O3 = 2CsAlO2 BaO + BeO =
BaBeO2
RbO + ZnO =
RbZnO2 SrO + SnO2
= SrSnO3
Li2O +
Fe2O3 = 2LiFeO2 <span>Na2O + PbO
= Na2PbO2</span>
СH4 + Cl2 = CH3Cl + HCl
2CH3Cl + 2Na = C2H6 + 2NaCl
C2H6 + Br2 = C2H5Br + HBr
C2H5Br + C4H9Br + 2K = C6H14 + 2KBr
1)<span>2Cu</span><span> + </span><span>O2</span><span> = </span>2CuO
2)Zn+Cl2=ZNCl2
3)2K+I2=2KI
4)<span>Mg+S=MgS</span>