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Mg + H2SO4 = MgSO4 + H2 (2)
1) пусть m(Fe) = xг, тогда n(Fe)= x/56 моль; Тогда m(Mg)= (5,12 –x) г, n(Mg)= (5,12-х)/24 моль.
2) масса (FeSO4) = у г, тогда n(FeSO4)= y/152 моль, тогда m(MgSO4)= (20,48 – y) г, n(MgSO4) = (20,48 - y)/120 моль;
3) Из (1) х/56 = у/152; у = 152х/56 =19х/7;
4)
Из (2) (5,12-х)/24 = (20,48 –у) /120; подставив значение у во второе уравнение, получим х- 2,24 г (масса железа),
тогда масса магния = 5,12-2,24 =2,88 г.
5) W(Mg)= 2,88*100%/5,12= 56,25%
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