Question

A student studies that magnesium (Mg) and iron (Fe) react with oxygen (O)
to form MgO and Feo. Although both compounds contain two atoms each
of their molecular masses are different. What is the reason for the
difference in their molecular masses?
(a) Difference in the atomic mass of iron and magnesium
(b) Difference in the number of iron and magnesium atoms
(c) Difference in the atomic number of iron and magnesium
(d) Difference in the number of O atoms in the two compounds
and their atomicity.​

Answer 1

Answer:

the difference mass between Feo and mgo is

Explanation:

because there is difference in the atomic number of iron and magnesium difference in atomic mass of iron and

Answer 2

MgO and FeO- Although both compounds contain two atoms each have different molecular masses because of the difference in the atomic mass of iron and magnesium.

• Both compounds have oxygen and two atoms.
• Only the main atoms in the compound are different and have different atomic masses. (i.e of Fe and Mg)
• This leads to the different molecular masses of the compounds.
• Mg - atomic mass = 24g
• Fe - atomic mass = 55.8g
• Atomic mass: FeO > MgO.