Question

please answer it very urgent​

Answer 1

Explanation:

Fe's mass is 55.84 u

Mg's mass is 24.30 u

and O's mass is 16 u

so FeO's mass is 55.84+16=71.84 u

and MgO's mass is 24.30+16=40.30 u

so the difference between FeO and MgO is

71.84 -40.30=31.54 u