39 g K -------1mol K---------6,023 .10²³ atomi K
17.
var stins - hidroxid de calciu = Ca(OH)2
bicarbonat de sodiu - carbonat acid de sodiu = NaHCO3
magnetita - oxid fero-feric = Fe3O4
miniu - oxid plumbic = Pb3O4
bauxita - oxid de aluminiu = Al2O3
MCa(OH)2= 40+ 2.16 + 2=74-----> 1mol=74 [74g/mol ]
MNaHCO3= 23+1 +12+ 3.16=84----->1mol=84g [84g/mol ]
M Fe3O4= 3.56 +4.16=232 ----> 1mol=232g [232g/mol ]
MPb3O4=3.207 +4.16=685------> 1mol=685g [ 685g/mol ]
MAl2O3=2.27 + 3.16=102 ----->1mol=102g [ 102g/mol ]
