CaCl2+H2SO4=CaSO4+2HCl
CaCl2+Na2CO3=CaCO3+2NaCl
CaCl2+ BaCO3 = CaCO3↓ + BaCI2
CaCl2+2NaOH=Ca(OH)2+2NaCl
<span>CaCl2 + H2SO4 = 2HCl + CaSO4</span>
W(Ca)=Ar(Ca)/Mr(Ca2F3)
Mr(Ca2F3)=2*40+3*19=137
W(Ca)=80/137=0.58=58%
1) N2 + 3H2 = 2NH3
2)NH3 + H2O = NH4OH