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Chemistry question help needed please!

5 replies

RoryGillmoresEvilTwin · 01/03/2020 19:39

This is the question I have on a mock paper:
Iron metal is oxidized by oxygen to form iron (III) oxide.
Write a balanced equation for this process

The answer is
4Fe (s) + 3O2 (g) >>>> 2Fe2 O_3 (s)

I'm struggling with where the 2 comes from in the products (2Fe2).

Any help would be massively appreciated!

OP posts:
Waitingforplastertodry · 01/03/2020 19:41

You start with four units (atoms) of elemental iron (4Fe) and make two units of iron oxide which has two iron atoms and 3 oxygen atoms per molecule

Mummytoalittleone · 01/03/2020 19:44

The 2 is because it is a balanced equation. You had 4Fe and now you have 2Fe2 or 2 x 2 which equals 4. The number of atoms must be equal on both sides of the equation. Hope that makes sense

KittenVsBox · 01/03/2020 19:45

You need to have an even number of O on the produce side, as O comes in pairs.
so, since there are only 3 O atoms in the product, you need to double both sides to have 6 O atoms (3 O2). That means 2 lots of [Fe2] in the product, and so 4 lots of elemental iron as starting materials.

Waitingforplastertodry · 01/03/2020 19:46

It’s basically saying that iron (Fe) plus oxygen (O2) makes iron oxide Fe2O_3 (no space between). Then the numbers have to balance and it becomes 4 iron atoms, plus 3 oxygen molecules to give 2 molecules of iron oxide (rust). On each side of the equation you have 4 iron atoms and 6 oxygen atoms

RoryGillmoresEvilTwin · 01/03/2020 19:49

Ok thank you! I had a total brain freeze there.

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