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b)Cl₂O₇
2.
4N₂O₃
4∧2N=8N
4∧3O=12O
tlenek azotu (V) - N(na górze V, na dole 2) O(na górze II, na dole 5)
tlenek chloru (VII) Cl (na górze VII, na dole 2) O (na górze II, na dole 7)
2)
4*2 = 8