A chemist must prepare 900.mL of 131μ M aqueous zinc oxalate ZnC2O4 working solution. He'll do this by pouring out some 168μmolL aqueous zinc oxalate stock solution into a graduated cylinder and diluting it with distilled water. Required:
Calculate the volume in of the zinc oxalate stock solution that the chemist should pour out. Be sure your answer has the correct number of significant digits

if two electrons have the same n, the same ℓ, and the same ml, then they are in the same orbital. the pauli exclusion principle states that no two identical fermions (a fancy word for electrons and other subatomic particles like electrons) may occupy the same quantum state in an atom simultaneously.

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 !