С+O2=CO2
CO2+Ca(OH)2=CaCO3+H2O
M(CaCI2)=111г/моль
n(CaCI2)=12,5*10²³/6,02*10²³=2,08моль
m(CaCI2)=111*2,08=230,5г
Ca3(PO4)2-----------3Ca
310г-----—-------------120г
120*100%/310=38.7%
2. Al2O3 M=102, m=204г
3. 2fe2o3 = 2fe+ 3o2, n(fe)=168/56=3=n(fe2o3), m(fe2o3)=160*3=480
4. ch4+o2=co2 + 2h2o, n(ch4)=n(co2), V(co2)=v(ch4)=5л
5.n(o2)=m/M=80/32. V=n*Vm=(80*22.4)/32=56
C2H5OH + CH3-CH2-COOH = C2H5-O-CO-CH2-CH3 + H2O