Q2.94P - Chemistry: Molecular Nature Of Matter And Change

Question

Correct each of the following formulas:

a. Barium oxide is $\mathit{B}\mathit{a}{\mathit{O}}_{\mathbf{2}}$

b. Iron(II) nitrate is $\mathit{F}\mathit{e}{\mathbf{\left(}\mathbf{N}{\mathbf{O}}_{\mathbf{3}}\mathbf{\right)}}_{\mathbf{3}}$

c. Magnesium sulfide is $\mathit{M}\mathit{n}\mathit{S}{\mathit{O}}_{\mathbf{3}}$

Step-by-Step Solution

Answer

The correct formulas are

a. $B{a}^{2+}+O^{2-}\to BaO$

b. $F{e}^{2+}N{O}_3^{1-}\to Fe{\left(N{O}_3\right)}_2$

c. $M{g}^{2+}+S^{2-}\to MgS$

Step 1:Formula of barium oxide

Barium has a charge of +2 and oxide has a charge of -2.

The charges of each ion will just interchange as subscripts of its molecular formula.

The subscript should also be reduced to the smallest whole numbers that retain the ratio of the atoms.

Barium oxide is$B{a}^{2+}+O^{2-}\to BaO$  .

Step 2: Formula of iron(II) nitrate

Iron has a charge of +2 and nitrate has a charge of -1.

The charges of each ion will just interchange as subscripts of its molecular formula 

Iron (II) nitrate is$F{e}^{2+}N{O}_3^{1-}\to Fe{\left(N{O}_3\right)}_2$ .

Step 3: Formula of magnesium sulfide

Magnesium has a charge of +2 and sulfide has a charge of - 2.

The charges of each ion will just interchange as subscripts of its molecular formula 

The subscript should also be reduced to the smallest whole numbers that retain the ratio of the atoms.

Magnesium sulfide is $M{g}^{2+}+S^{2-}\to MgS$ .