Răspuns:
Avem nevoie de : M.CaO= 56g/mol M,Ca(OH)2= 74g/mol
si de ecuatia chimica
1mol........................1mol sau, in grame
CaO + H2o---> Ca(OH)2
56g.........................74g
5,6g........................x=m= 7,4gCa(OH)2
1mol Ca(OH)2............74g
x.......................................7,4
x=niu= 0,1mol SAU se aplica formual niu=m/M
Explicație: