Sapling Week7&8 #18

[Xinying Wang_3C]

Hi, I am stuck on question 18 in this week's sapling. I put Fe+O2+H2O for the reactants and Fe2O3-3H2O for the product, and I get 4Fe+3O2+6H2O⟶2(Fe2O3∙3H2O)+12e-, which is not correct. I am wondering which step did I do wrong.

[AdilaAhmed3I]

Your basic set up should like this:

Fe + O2 +H2O--> Fe2O3∙ 3H2O

You should not need any electrons in this equation because you could just balance it from this equation. So first balance the Fe and then the H2O. After balancing those, then you can balance the oxygens.

[Kayla Law 2D]

Hi! You don't need to include the electrons in the reaction. Also, don't put parentheses around the Fe2O3∙3H2O(s). Everything else looks right! Hope this helps! :)

[Phoebe Joseph]

Why dont you need to balance electrons through half reactions in this equation?

[Charmaine Ng 2D]

You can balance this equation without the electrons, so you don't need those, and you also don't need the parentheses! :))