Answer:
Percent composition by element
Element Symbol # of Atoms
Hydrogen H 5
Carbon C 3
Nitrogen N 3
Oxygen O 9
MgCl2 because it is the only option in which a metal appears with a nonmetal. In this case, the metal transfers electrons to the nonmental because the metal has a lower ionization energy.
Both figures are mixtures,
Figure II is a heterogenous mixture
Figure I is a homogenous mixture
To balance this equation simply place the coefficient 2 in front of both the iron metal and the iron II oxide FeO.
