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O 16 u
dzielimy 64/16 i wyszło stodunek 4/1
2) K 2*39=78
O 16u
78/16 ---> 39/8 stosunek
3) Mn 2*55=110u
O= 7 *16u =112
110/112--> 55/56
mCu 64u 4
------- = -------- = --------
mO 16u 1
K₂O
2mK 2 * 39u 39
------- = ------------- = --------
mO 16u 8
Mn₂O₇
2*mMn 2 * 55u 55
---------- = --------------- = --------
7*mO 7*16u 56