Substance Density
Water
1.00 g = 1 mL
7.87 g = 1 mL
Iron
Lead
11.34 g = 1 ml.
You are given a 1.00 kilogram sample of each substance above. Which sample has the greatest mass?

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.

im doing test rn im going with 2 but ill give answer if itss wrong,   : )