What is the correct formula for iron (III) sulfide

1) What is the correct formula for iron (III) sulfide?

A) Fe2S₂

B) Fe2S

C) FeS

D) FeS2

E) Fe2S3

2) write the balanced COMPLETE ionic equation for the reaction when BaCl₂ and Na₂CO₃ are mixed in aqueous solution

The Correct Answer and Explanation is :

1) Correct formula for iron (III) sulfide:

Answer: E) Fe₂S₃

Explanation:

Iron (III) sulfide refers to a compound containing iron with a +3 charge (Fe³⁺) and sulfide ions with a -2 charge (S²⁻). To find the correct formula, we balance the charges by making sure the total positive charge equals the total negative charge.

• The charge on one Fe³⁺ ion is +3, and the charge on one sulfide (S²⁻) ion is -2.
• To balance the charges, we need two Fe³⁺ ions (which would give a total positive charge of +6) and three sulfide ions (which would give a total negative charge of -6).

Therefore, the formula for iron (III) sulfide is Fe₂S₃, which ensures the charges are balanced.

2) Balanced COMPLETE ionic equation for the reaction between BaCl₂ and Na₂CO₃:

The reaction between barium chloride (BaCl₂) and sodium carbonate (Na₂CO₃) in aqueous solution forms barium carbonate (BaCO₃) as a precipitate and sodium chloride (NaCl) in solution.

Step-by-step process:

• Write the unbalanced molecular equation: [
  \text{BaCl}_2(aq) + \text{Na}_2\text{CO}_3(aq) \rightarrow \text{BaCO}_3(s) + 2 \text{NaCl}(aq)
  ]
• Write the ionic equation: Since BaCl₂ and Na₂CO₃ are soluble in water, they dissociate into their ions in aqueous solution: [
  \text{Ba}^{2+}(aq) + 2 \text{Cl}^-(aq) + 2 \text{Na}^+(aq) + \text{CO}_3^{2-}(aq) \rightarrow \text{BaCO}_3(s) + 2 \text{Na}^+(aq) + 2 \text{Cl}^-(aq)
  ]
• Complete ionic equation: [
  \text{Ba}^{2+}(aq) + 2 \text{Cl}^-(aq) + 2 \text{Na}^+(aq) + \text{CO}_3^{2-}(aq) \rightarrow \text{BaCO}_3(s) + 2 \text{Na}^+(aq) + 2 \text{Cl}^-(aq)
  ]
• Identify the spectator ions: Sodium ions (Na⁺) and chloride ions (Cl⁻) are present on both sides of the equation and do not participate in the reaction, so they are spectator ions.
• Remove the spectator ions to write the net ionic equation: [
  \text{Ba}^{2+}(aq) + \text{CO}_3^{2-}(aq) \rightarrow \text{BaCO}_3(s)
  ]

This is the balanced net ionic equation for the reaction.

Explanation:

• Ba²⁺ and CO₃²⁻ ions combine to form BaCO₃, a solid precipitate, which is the driving force behind the reaction.
• Na⁺ and Cl⁻ ions remain in the aqueous solution as spectator ions and do not directly participate in the formation of the precipitate.

By writing the complete ionic equation and then eliminating the spectator ions, we arrive at the net ionic equation that reflects the actual chemical change in the reaction.