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what

2n2o5 (g) > > 4no2(g) + o2(g)  dinitrogen pentoxide is the chemical compound with the formula n₂o₅. also known as nitrogen pentoxide, n₂o₅ is one of the binary nitrogen oxides, a family of compounds that only contain nitrogen and oxygen.
so we need oxygen and nitrogen with these co-effiecients to balance the theequation.