2.115 Write formulas for each of the following compounds: (a) Sodium peroxide (b) Aluminum bromide (c) Chromium(III) sulfate

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### Chemical Compound Formulas - Practice Problem

**Problem 2.115**

**Objective:** Write formulas for each of the following compounds:
  
  - **(a) Sodium peroxide**
  - **(b) Aluminum bromide**
  - **(c) Chromium(III) sulfate**

**Instructions:** Provide the chemical formulas for the named compounds. This exercise is designed to help students master the process of converting compound names to their respective chemical formulas. 

**Solution Guide:**

1. **Sodium Peroxide**
   
   Sodium (Na) has a charge of +1 and peroxide (O₂) has a charge of -2. The formula for sodium peroxide is:
   
   \[
   \text{Na}_2\text{O}_2
   \]

2. **Aluminum Bromide**
   
   Aluminum (Al) has a charge of +3 and bromine (Br) has a charge of -1. The formula for aluminum bromide is:
   
   \[
   \text{AlBr}_3
   \]

3. **Chromium(III) Sulfate**
   
   Chromium(III) indicates a charge of +3. Sulfate (SO₄) has a charge of -2. The formula for chromium(III) sulfate is:
   
   \[
   \text{Cr}_2(\text{SO}_4)_3
   \]

**Understanding Charges:**
- For **Sodium Peroxide**, the +1 charge of each sodium ion balances the -2 charge of the peroxide ion by having two sodium ions for every peroxide ion.
- For **Aluminum Bromide**, three bromide ions, each with a -1 charge, balance the +3 charge of one aluminum ion.
- For **Chromium(III) Sulfate**, two chromium ions, each with a +3 charge, balance three sulfate ions, each with a -2 charge, resulting in a neutral compound. 

These exercises are fundamental in understanding chemical nomenclature and the relationship between the charge of ions and the stoichiometry of compounds.
Transcribed Image Text:### Chemical Compound Formulas - Practice Problem **Problem 2.115** **Objective:** Write formulas for each of the following compounds: - **(a) Sodium peroxide** - **(b) Aluminum bromide** - **(c) Chromium(III) sulfate** **Instructions:** Provide the chemical formulas for the named compounds. This exercise is designed to help students master the process of converting compound names to their respective chemical formulas. **Solution Guide:** 1. **Sodium Peroxide** Sodium (Na) has a charge of +1 and peroxide (O₂) has a charge of -2. The formula for sodium peroxide is: \[ \text{Na}_2\text{O}_2 \] 2. **Aluminum Bromide** Aluminum (Al) has a charge of +3 and bromine (Br) has a charge of -1. The formula for aluminum bromide is: \[ \text{AlBr}_3 \] 3. **Chromium(III) Sulfate** Chromium(III) indicates a charge of +3. Sulfate (SO₄) has a charge of -2. The formula for chromium(III) sulfate is: \[ \text{Cr}_2(\text{SO}_4)_3 \] **Understanding Charges:** - For **Sodium Peroxide**, the +1 charge of each sodium ion balances the -2 charge of the peroxide ion by having two sodium ions for every peroxide ion. - For **Aluminum Bromide**, three bromide ions, each with a -1 charge, balance the +3 charge of one aluminum ion. - For **Chromium(III) Sulfate**, two chromium ions, each with a +3 charge, balance three sulfate ions, each with a -2 charge, resulting in a neutral compound. These exercises are fundamental in understanding chemical nomenclature and the relationship between the charge of ions and the stoichiometry of compounds.
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