Молекулярные массы:
Na2SO4 - 142
N2O3 - 76
Валентности:
1) S = +6, O = -2
2) CL - +5, O = -2
3) H = +1, S = -2
4) O = +2, F = -1
5) Al = +3, O = -2
6) Cr = +6, O = -2
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Answers & Comments
Молекулярные массы:
Na2SO4 - 142
N2O3 - 76
Валентности:
1) S = +6, O = -2
2) CL - +5, O = -2
3) H = +1, S = -2
4) O = +2, F = -1
5) Al = +3, O = -2
6) Cr = +6, O = -2