1.
M.HNO3 = 1+14+3x16 = 63 g/mol
n = m/M = 630/63 = 10 moli HNO3
2.
M.HBr = 1+80 = 81 g/mol
81g HBr ............... 1g H
810 g .................. x = 10g H
3.
-2 oxizi
CaO = oxid de calciu
Al2O3 = oxid de aluminiu
-2 baze
NaOH = hidroxid de sodiu
Ca(OH)2 = hidroxid de calciu
-2 acizi
HCl = acid clorhidric
H2SO4 = acid sulfuric
-2 saruri
NaCl = clorura de sodiu
CuSO4 = sulfat de cupru