Răspuns:
1.
1mol..........................1mol
CaO + H2O => Ca (OH)2
3moli...........................xmoli
x= 3×1/1=3 moli Ca(OH)2
2.
1mol......2 moli
2ZnO + O2=> 2ZnO
ymoli....5moli
y=5×1/2=2,5 moliO2
