Dobierz współczynniki w równaniach chemicznych.
Na + O² ----> Na²O
P + H² ----> PH³
Ag² O -----> Ag + O²
Br² + O² ----> Br²O ( i tutaj mała 7 xd)
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4Na + O₂ --> 2Na₂O
2P + 3H₂ --> 2PH₃
2Ag₂O --> 4Ag + O₂
2Br₂ + 7O₂ --> 2Br₂O₇
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Pozdrawiam :)