Răspuns:
2Ca + O2---> 2CaO
CaO +H2O---> Ca(OH)2
Ca(OH)2 +2HCl---> CaCl2 + 2H2O
b=Ca(OH)2
nCa:nH:nO= 1:2:2
M=(40gCa+2gH+2X16gO)/mol=74g/mol
74g Ca(OH)2......40gCa.....32gO......2gH
100G...................X....................Y............Z
X=54,1%Ca
Y=43,2%O
Z=2,7%H
Explicație: