Chemistry
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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**Determining the Molecular Formula of Compound X**

In this problem, you are given information about the combustion of a compound known as Compound X, which is composed of carbon, hydrogen, and possibly oxygen. The compound has a molecular molar mass of 26 g/mol. When 4.00 g of Compound X is burned completely in excess oxygen, the masses of the resulting products are carefully measured, as shown in the table below.

| **Product**         | **Mass**  |
|----------------------|-----------|
| Carbon dioxide (CO₂) | 13.54 g   |
| Water (H₂O)          | 2.77 g    |

Using this information, your goal is to determine the molecular formula of Compound X.

1. **Determine the moles of carbon and hydrogen:**
   - From the mass of carbon dioxide (CO₂), calculate the moles of carbon.
   - From the mass of water (H₂O), calculate the moles of hydrogen atoms.

2. **Consider the potential presence of oxygen:**
    - If Compound X contains oxygen, evaluate its contribution by comparing the total mass of the products to the mass of Compound X. 

3. **Calculate the empirical formula:**
   - Combine the ratios of moles of each element to find the simplest whole number ratio.

4. **Determine the molecular formula:**
   - Use the given molecular molar mass (26 g/mol) to convert the empirical formula to the molecular formula.

You can enter your findings into the provided input box to finalize your answer. 

(Note: The molecular formula should be expressed in terms of the subscripts of the elements, indicating the quantity of each element in a molecule of Compound X.)
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Transcribed Image Text:**Determining the Molecular Formula of Compound X** In this problem, you are given information about the combustion of a compound known as Compound X, which is composed of carbon, hydrogen, and possibly oxygen. The compound has a molecular molar mass of 26 g/mol. When 4.00 g of Compound X is burned completely in excess oxygen, the masses of the resulting products are carefully measured, as shown in the table below. | **Product** | **Mass** | |----------------------|-----------| | Carbon dioxide (CO₂) | 13.54 g | | Water (H₂O) | 2.77 g | Using this information, your goal is to determine the molecular formula of Compound X. 1. **Determine the moles of carbon and hydrogen:** - From the mass of carbon dioxide (CO₂), calculate the moles of carbon. - From the mass of water (H₂O), calculate the moles of hydrogen atoms. 2. **Consider the potential presence of oxygen:** - If Compound X contains oxygen, evaluate its contribution by comparing the total mass of the products to the mass of Compound X. 3. **Calculate the empirical formula:** - Combine the ratios of moles of each element to find the simplest whole number ratio. 4. **Determine the molecular formula:** - Use the given molecular molar mass (26 g/mol) to convert the empirical formula to the molecular formula. You can enter your findings into the provided input box to finalize your answer. (Note: The molecular formula should be expressed in terms of the subscripts of the elements, indicating the quantity of each element in a molecule of Compound X.)
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