H2SO4+CaCl2=2HCl+CaSO4
m вещества(CaCl2)=m раствора(CaCl2)*w(CaCl2)/100\%=22.2*20/100\%=4.44 г
n(CaCl2)=m(CaCl2)/M(CaCl2)=4.44/111=0.04 моль
n(H2SO4)=n(CaCl2)=0.04 моль
Ответ. b
SiO₂ + 2C = Si + 2CO
Si + 2Mg = Mg₂Si
Mg₂Si + 4HCl = 2MgCl₂ + SiH₄
SiH₄ + 2O₂ = SiO₂ + 2H₂O
SiO₂ + 2NaOH = Na₂SiO₃ + H₂O
Na₂SiO₃ + 2HCL = 2NaCl + H₂SiO₃
H₂SiO₃ = SiO₂ + H₂O
<span>2SiO₂ + 2Li[AlH₄] = 2SiH₄ +Li₂O + Al₂O₃</span>
C3H6Cl2+2KOH=CH3CH2CHO+2KCl+H2O
3CH3CH2CHO+K2Cr2O7+4H2SO4=3CH3CH2COOH+K2SO4+Cr2(SO4)3+4H2O
CH3CH2COOH+Cl2=CH3CH(Cl)COOH+HCl
CH3CH(Cl)COOH+NaHCO3=CH3CH(Cl)COONa+H2O+CO2
CH3CH(Cl)COONa+CH3CH2Br=CH3CH(Cl)COOC2H5+NaBr