Закон сохранения массы веществ не соблюдается в уравнении реакции:

а) 4Al + 3O2 = 2Al2 O3

б) C + H2 = CH4

в) 2Mg + O2 =2MgO

г) Zn + 2Hcl = ZnCl2 + H2

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