FeCl₃ + 3NaOH = Fe(OH)₃ + 3NaCl
Сн2О. 1,87•16=30
4,5____3,36. 4,5_____2,7
30____х. 30____х
Х=22.4. х=18
Х+О2=СО2+Н20
СН2О
CuCl2+2NaOH=2NaCl+Cu(OH)2<span>↓</span>