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Бромчик
1. K(1) O(2)
Ba(2) O(2)
Cr(6) O(2)
Pb(4) O(2)

2. Ar(P)=31
Ar(O)=16
Mr=(31×2)+(16×5)=142
w(P)=2×31×100% / 142 = 43,7%
w(O)=5×16×100% / 142 = 56.3%

3. 2Zn + O2 = 2ZnO
4Na + O2 = 2Na2O
Au + O2 = AuO2
Cr + O2 = CrO2

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bvv1505

Держи ,удачи !!!!!!!!!!!!!!!!!!!!

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