There's reaction involving gas:
Fe + H2SO4 -> Fe2(SO4)3 + H2O + SO2
How Fe2(SO4)3 is occur? I know the "2" comes from the ion of SO4, but I don't know where the "3" comes up.
Is the Fe2(SO4)3 comes up from half-reaction method?
Is the reaction occurs in one step or multiple steps?
Please, I really need the answers :-(
The 3 comes from the valence of Fe, which in this case is +3, given
However, in nature, Iron reacts with dilute sulfuric acid to produce IronII sulfate and hydrogen.
In Nature, iron reacts with concentrated sulfuric acid to produced IRON II Sulfate and sulfur dioxide (and water or steam).
So my conclusion is whomever wrote the equation for you do decipher did not consider nature. The reaction should have been written this way:
Fe(s) + H2SO4(conc) -> Fe(SO4)(s) + H2O(l) + SO2)g)
Fe2 has oxidation number +III and (SO4)3 has ox. n -II. Its a cross rule. Now is whole molecule in electroneutral state. O has ox. number -II and and (SO4) is -II,so S has ox number VI, because4*-II (O)= -VIII + VI (S) is -II
To understand why Fe2(SO4)3 appears in the balanced equation, let's break down the compounds involved and determine their respective charges.
Fe - Iron has a charge of +2.
H2SO4 - This is sulfuric acid, consisting of H+ ions and the polyatomic ion SO4-2 (sulfate).
Fe2(SO4)3 - This is the product compound formed after the reaction.
The sulfate ion (SO4-2) has a charge of -2. Since there are three sulfate ions in Fe2(SO4)3, the total charge contributed by the sulfate ions is -6 (3 x -2 = -6). In order to balance the charges of the compounds involved in the reaction, the iron(III) ion (Fe3+) in Fe2(SO4)3 carries a charge of +3. Therefore, Fe2(SO4)3 indicates that there are two iron(III) ions, each with a charge of +3, present in the compound.
This balanced equation does not involve the half-reaction method, which is typically used in redox reactions to separate the oxidation and reduction processes.
Regarding the number of steps in the reaction, it is difficult to determine just from the balanced equation. The equation itself represents the overall reaction, and it is possible that several intermediate steps may have occurred before reaching the final products. To determine the specific steps involved in this reaction, further information about the reaction conditions, catalysts, or reaction mechanism might be necessary.
I hope this explanation helps clarify your questions! Let me know if you have any further inquiries.