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Anonymous users2024-02-06As long as you're willing to do the math, it's easy to do......
The added mass of the solid is the mass of the oxygen element in the oxide, for.
The mass ratio of iron to oxygen is 56:22=28:11
1. The mass ratio of iron to oxygen in ferric tetroxide is 56*3:16*4=21:82, and the mass ratio of iron to oxygen in iron oxide is 56*2:
16*3=7:33, the mass ratio of iron to oxygen in ferrous oxide is 56:16=28:
828:11 should be between the ratios of all solid products, so there must be iron oxides. (Only this one is bigger than it), choose C.
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Anonymous users2024-02-053fe+2o2=fe3o4
x solution yields x=2fe+o2=2feo
The solution yields y=4fe+3o2=2fe2o3
56---z
The solution is z=8g
Now it is found that iron is burned in a sufficient amount of O2 to obtain a solid, only the solid mass obtained by combustion to produce Fe2O3 is greater than that, and the mass of the other two oxides obtained is less than that, to meet the final mass is, there must be part of Fe2O3, and part of Fe3O4 or FeO
From this, it can be known that C is chosen
Since it is a sufficient amount of oxygen, d can be excluded.
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Anonymous users2024-02-04The amount of iron in the solid
Iron content in Fe3O4 168 232=
Iron content in feo = 56 72 =
The iron content in Fe2O3 = 112 160 = 70% Since it is a sufficient amount of oxygen, it is impossible to have iron element.
So the answer is cFe3O4 and Fe2O3 (choose one greater than and one less than.)
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Anonymous users2024-02-03A multiple-choice question, it would be too cost-effective to calculate for so long, let me make a simple one.
In fact, because it has been said that there is enough oxygen, there can be no iron, so a and d are excluded first.
The difference between b and c lies in these oxides of iron. In fact, FeO, Fe2O3, and Fe3O4 can be regarded as the combination of one iron and 1 oxygen, and 4 3 oxygen, respectively. Because it is iron, if it is pure oxide, it must be the one with more oxygen binding that is the heaviest, that is, Fe2O3 grams, other Fe3O4 grams, FeO grams.
Now it's grams, if fe3o4 and feo are combined, there is no way to achieve this result, so the result must be c.
Molecular makeup. Because it is bonded with covalent bonds, it is a covalent compound.
3co2...This conservation of atoms can be seen by looking at it. >>>More
Hydrochloric acid is a strong acid, pH = 1 means C(HCl) = , and the mixing of MOH with HCl in equal volumes happens to be completely reacted to indicate that C(MoH) = is correct, so option A is correct. >>>More
It should be pure iron, because pig iron contains a lot of C, which will make the substance impure and the boiling point will increase.
1. Reasonable When the mixed gas of oxygen and carbon monoxide is passed through the hot copper oxide, because copper oxide is oxidizing and carbon monoxide is reducing, the two can react with oxygen. Copper and carbon dioxide are generated, and the oxygen in the mixed gas does not participate in the reaction, it still exists in the form of oxygen, at this time, the mixed gas has no carbon monoxide, but becomes a mixture of oxygen and carbon dioxide, when the mixed gas is passed into the clarified lime water, due to the presence of carbon dioxide, it can be observed that the clarified lime water becomes turbid. Therefore, this test method is reasonable. >>>More