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Mixtures of two or more known substances in FeO,Fe,Fe2O3, Fe3O4 If that atomic numb ratio of iron element to oxygen element is known to be 1:1, A must contain both Fe2O3 and Fe3O4 B contains only Fe and Fe2O3, Fe3O4 C must contain FeO D Unable to determine if FeO is present In a mixture of Na2S,Na2SO3,Na2SO4 three substances If the mass fraction of oxygen element is 22%, what is the mass fraction of sulfur element
The atomic number ratio of iron to oxygen is 1:1 FeO, without O, i.e., much more than 1:1 Fe2O3,2:3, less than 1:1 Fe3O4,3:4, less than 1:1. Now the atomic number ratio of iron to oxygen is 1:1, i.e., FeO is irrelevant, dispensable, and no matter how must be Fe, Fe2O3 and Fe3O4.
Chemical Equation for the Reaction of Hydrogen Sulfide with Concentrated Sulfuric Acid
The concentrated sulfuric acid is a strong oxidant, and hydrogen sulfide is a typical reductant. The oxidation-reduction reaction takes place. Note that whether the product after the reaction can exist is the key:
3H2S+H2SO4==4H2O+3S↓
The concentrated sulfuric acid is a strong oxidizing agent, and hydrogen sulfide is a typical reducing agent. The oxidation-reduction reaction takes place. Note that the product after the reaction can exist is the key:
3H2S+H2SO4==4H2O+3S↓
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- 1. To a certain amount of mixture of Fe, FeO and Fe2O3, add 120mL 4mol L of dilute nitric acid to completely dissolve the mixture, release 1.344L NO (standard condition), add KSCN solution to the resulting solution, and no red color appears. If the mixture of the same mass is reduced by heating with sufficient hydrogen, the amount of iron can be () A. 0.24 mol B. 0.21 mol C. 0.16 mol D. 0.14 mol
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