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2. 1. 2. 3. 4. 5. 6. 6 3. , ? , . . 4. . 5. NaCI 15 6.
7. 4 8 7 6 3 2 9 1 O 2 N 2 5 8. 5 1 3 7 8 4 9 N 2 O 2 9. . N 2 O 2 = + =+ = + () = + 10. , 11. ? = 100 10 ? 12. :, , ,, : ,, 13. . 50 14,2 475 5% 45 405 420 4,7 // // // / % / 1- 300 350 2- 25 500 3- 450 10% 4- 400 20 14. 15.
16. , 2 . 17. .