1. Що означають записи: 5NO2, 2HNO3, 4N2, 3N, 703, 03

2. Розставте коефіцієнти:

Ca+ O2 = CaO
Fe + O2 = F304
CH4 = C2H2+H2
AIS = AI2S3
HCI + Fe = FeCl2 + H2​
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