Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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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.](https://content.bartleby.com/qna-images/question/6e830786-058e-49dd-8798-047547f22476/a29812c2-3c53-4fb0-9079-a817926e64eb/3wtmb5o.png)
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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