1. 4
2. 2
3. 1
4. 4
5. 2
6. 4
7. 2
8. 1
9. 3
10. 2
11. 2
12. 4
13. 2
14. 4
15. 3
16. 2
17. 3
18. 4
19. 4
20. 4
21. 3
22. 3
23. 4
24. 2
25. 2
26. 4
27. 3
28. 3
1. Fe(NO3)3 242
C2H5NH2 45
2. a) 2Zn + O2 = 2ZnO
ZnO + 2HCl = ZnCl2 + H2O
ZnCl2 + 2NaOH = Zn(OH)2 + 2NaCl
б) C2H4 + H2O/H2SO4 p = C2H5OH
C2H5OH + CuO/t = CH3CHO + Cu + H2O
CH3CHO + Cu(OH)2 = CH3COOH + Cu2O + H2O
CH3COOH + C2H5OH + H2SO4/t = CH3COOC2H5 + H2O
3. w% = mв-ва(1)*100%/mр-ра(2)
m1 = w%*m2/100% = 4*250/100 = 10 г
4. CuO + H2SO4 = CuSO4 + H2O
n(CuO) = 10/80 = 0,125 моль
m(соли) = 0,125*160 = 20 г