Verified answer

4 - 3

5 -4

6 - 3

Fe2(SO4)3 +6NaOH = 2Fe(OH)3 +3Na2SO4

1+6+2+3=12

7-2

30.1*10^23 : 6 *10^23 * 22.4 = 112 л

8-1

SiH4

9 - 3

11 - 4

4NH3 +5O2 =4NO + 6H2O

O2 - окислитель