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N2+3Mg=Mg3N2 - уравнение
Находим моль Mg 36/24=1,5(моль)
По уравнению моль N2 в три раза меньше Mg получается 1,5/3=0,5(моль)
V(N2)= 0,5*22,4=11,2(л)
Ответ:11,2

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