a)2moli NaOH
b)315 g HNO3
c)17gNH3..........3gH
340g.................x x=60g
d)compozitia procentuală nu ,,concentratia ,,atentie
74gCa(OH)2.....40gCa..........32gO,,.......2gH
100.......................X..................Y................Z
X=54,05% Y=43,24% Z=2,71%