Question

formula

1. sodium phosphide
2. magnesium nitrate
3. lead (ii) sulfite
4. calcium phosphate
5. ammonium sulfate
6. silver cyanide
7. aluminum sulfide
8. beryllium chloride
9. copper (i) arsenide
10. iron (iii) oxide

Explanation:

Step1: Correct given formulas first

1. Sodium phosphide: $\text{Na}_3\text{P}$ (corrected from $\text{Na}_9\text{P}$; Na⁺, P³⁻: 3(+1)+1(-3)=0)
2. Magnesium nitrate: $\text{Mg(NO}_3\text{)}_2$ (corrected from $\text{Mg NO}_3$; Mg²⁺, $\text{NO}_3^-$: 1(+2)+2(-1)=0)

Step2: Find lead(II) sulfite formula

Pb²⁺, $\text{SO}_3^{2-}$: 1(+2)+1(-2)=0 → $\text{PbSO}_3$

Step3: Find calcium phosphate formula

Ca²⁺, $\text{PO}_4^{3-}$: 3(+2)+2(-3)=0 → $\text{Ca}_3(\text{PO}_4)_2$

Step4: Find ammonium sulfate formula

$\text{NH}_4^+$, $\text{SO}_4^{2-}$: 2(+1)+1(-2)=0 → $(\text{NH}_4)_2\text{SO}_4$

Step5: Find silver cyanide formula

Ag⁺, $\text{CN}^-$: 1(+1)+1(-1)=0 → $\text{AgCN}$

Step6: Find aluminum sulfide formula

Al³⁺, S²⁻: 2(+3)+3(-2)=0 → $\text{Al}_2\text{S}_3$

Step7: Find beryllium chloride formula

Be²⁺, Cl⁻: 1(+2)+2(-1)=0 → $\text{BeCl}_2$

Step8: Find copper(I) arsenide formula

Cu⁺, As³⁻: 3(+1)+1(-3)=0 → $\text{Cu}_3\text{As}$

Step9: Find iron(III) oxide formula

Fe³⁺, O²⁻: 2(+3)+3(-2)=0 → $\text{Fe}_2\text{O}_3$

Answer:

1. $\text{Na}_3\text{P}$
2. $\text{Mg(NO}_3\text{)}_2$
3. $\text{PbSO}_3$
4. $\text{Ca}_3(\text{PO}_4)_2$
5. $(\text{NH}_4)_2\text{SO}_4$
6. $\text{AgCN}$
7. $\text{Al}_2\text{S}_3$
8. $\text{BeCl}_2$
9. $\text{Cu}_3\text{As}$
10. $\text{Fe}_2\text{O}_3$