4Fe (s) + 3 O2 (g) → 2 Fe2O3 (s) A. What is the oxidation number for each item in this equation?
B. What is being oxidized?
C. What is being reduced?
D. What is the oxidizing agent?
E. What is the reducing agent?

Explanation:

The number acquired by an element after the lose or gain of an electron is called oxidation number.

For example,

Here, oxidation number of Fe(s) is 0 and Fe in is +3.

Oxidation number of O in is 0 as it is present in its elemental state.

The oxidation number of O in is calculated as follows.

Hence,  oxidation number of O in is -2.

how to make a simple air condition

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !