Вычислитите число атомов О(кислорода):
1. 2СО + О 2
2. СО 2 + 2Н 2 О
3. 2Н 2 О + P 2 O 5
4. Na 2 SO 4 + H 2 O
5. Ca(OH) 5 + H 2 SO 4
Помогите пожалуйста.
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