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NESATURATIA. Cum se calculeaza ?

Răspuns :

Consideram substanta: CxHyOzNpSwXq
NE=[2+x(4-2)+y(1-2)+z(2-2)+p(3-2)+w(2-2)+q(1-2)]/2
4-valenta C
3-valenta N
2-valenta O, S
1-valenta H, X(Cl, Br, F, I)