Two iron oxide samples are given to you where one is red and the other is black. you perform a chemical analysis and you find that the red sample has a fe/o mass ratio of 2.327 and the black has a fe/o mass ratio of 3.491. you suspect the red sample is simple rust or fe2o3. what is the chemical formula for the black sample?

Chemical formula for the black iron oxide sample is FeO

Explanation:

Given:

Mass ratio of black iron oxide sample, Fe/O = 3.491

To determine:

The chemical formula

Calculation:

The mass ratio is Fe:O = 3.491 : 1

Mass of Fe = 3.491 g

Mass of O = 1.000 g

Atomic mass of Fe =55.85 g/mol

Atomic mass of O = 16.00 g/mol

Therefore, the molar ratio of Fe:O = 1:1

Hence, chemical formula is FeO