13. Rumus kimia besi (III) sulfat berikut ini adalah __ A. Fe_(2)(SO_(4))_(3) D. Fe_(3)(SO_(4))_(3) B. Fe_(2)SO_(4) C. Fe_(2)SO_(3) E. FeSO_(3)

The correct answer is **A. Fe₂(SO₄)₃**. Here's why:* **Iron (III)** indicates that the iron ion has a +3 charge (Fe³⁺).* **Sulfate** is the polyatomic ion SO₄²⁻.To balance the charges, we need two iron ions (2 x +3 = +6) and three sulfate ions (3 x -2 = -6). This gives us the formula **Fe₂(SO₄)₃**.