According to the following balanced equation, 2 formula units of iron (III) oxide (Fe2O3) can be formed by reacting 4 atoms of iron (Fe) with 3 molecules of oxygen gas (O2). If 12 atoms of iron are reacted with 6 molecules of oxygen gas, which is the limiting reactant and how many atoms or molecules will be left over? 4Fe + 3O2 → 2Fe2O

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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~ trueboss72

answer///carbon;