A zero-order reaction has a constant rate of 3.10×10−4 M/s. If after 40.0 seconds the concentration has dropped to 6.50×10−2 M, what was the initial concentration?

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.