Проставить коэффициенты в следующих реакциях соединения и разложения:
a) NH3 + H2SO4 = (NH4)2SO4
B) Mg + O2 = Mg0
C) H3PO4 = P2O5 + H2O
D) HNO3 = NO2 + O2 + H2O
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