# What is the actual formula for iron rust ??

##### 1 Answer

#### Explanation:

Rust is just iron oxide, so it is made up of iron and oxygen. We can find the empirical formula (simplest ratio of a compound's components) by looking at the ions each element forms.

Oxygen forms

Compounds have an overall neutral charge, so we need to find a combination of iron and oxygen which results in their charges balancing out. This basically involves finding the lowest common multiple of their two charges - so for 2 and 3 this is 6, and so we have

This gives us the final formula

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