Which compound contain an iron with a 3+ charge

Triiron tetraoxide

Explanation:

Fe304

Note : 3 & 4 are subscripts

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

explanation:

0.07 g/cm³

1.37 g/cm³