You have 4.2 moles of water. how many oxygen atoms do you have?

Firstly, the formula of water is H2O. There is 1 mole of oxygen atoms per mole of water. Therefore, in 4.2 moles of water there are 4.2 moles of oxygen atoms. The real amount is calculated as follows:

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.

the answer is c.the valence of the atoms combine .