Question

how many moles of fe are present in 30g of rust?

Answer 1

You need to find the caps key and use it. fe isn't anything. CO, Co, co have different meanings.
Rust is one of those complicated formulas. If we assume the formula is Fe2O3.
mols Fe2O3 = 30/molar mass Fe2O3 = ?
Then 2 x that = mols Fe.

Answer 2

i dont get it

Answer 3

Not understandable

Answer 4

divide the given number by molecular mass of rust and then multilply by two