6. Chemical analysis of an unknown compound shows that it contains 64.9% C, 13.5% H, and 21.6% O by mass. At 120°C and 750 mmHg, 2.00 L of the gaseous compound weighs 4.60 g. a. What is the empirical formula of the compound? b. What is the molar mass of the compound? c. What is the molecular formula of the compound?

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## Chemical Analysis Problem

### Problem Statement

6. Chemical analysis of an unknown compound shows that it contains 64.9% Carbon (C), 13.5% Hydrogen (H), and 21.6% Oxygen (O) by mass. At a temperature of 120°C and pressure of 750 mmHg, 2.00 liters (L) of the gaseous compound weighs 4.60 grams (g).

**Questions:**
a. What is the empirical formula of the compound?
b. What is the molar mass of the compound?
c. What is the molecular formula of the compound?

### Explanation
- The empirical formula represents the simplest whole-number ratio of atoms in a compound.
- The molar mass is the mass of one mole of a given substance, usually expressed in grams per mole (g/mol).
- The molecular formula represents the actual number of atoms of each element in a molecule of the compound. 

### Next Steps:
1. Use the given mass percent composition to determine the mole ratio of the elements in the compound.
2. Calculate the empirical formula based on the simplest whole-number ratio.
3. Using the Ideal Gas Law and given conditions (temperature, pressure, volume, and mass), determine the molar mass.
4. Use the empirical formula and the molar mass to determine the molecular formula of the compound.
Transcribed Image Text:## Chemical Analysis Problem ### Problem Statement 6. Chemical analysis of an unknown compound shows that it contains 64.9% Carbon (C), 13.5% Hydrogen (H), and 21.6% Oxygen (O) by mass. At a temperature of 120°C and pressure of 750 mmHg, 2.00 liters (L) of the gaseous compound weighs 4.60 grams (g). **Questions:** a. What is the empirical formula of the compound? b. What is the molar mass of the compound? c. What is the molecular formula of the compound? ### Explanation - The empirical formula represents the simplest whole-number ratio of atoms in a compound. - The molar mass is the mass of one mole of a given substance, usually expressed in grams per mole (g/mol). - The molecular formula represents the actual number of atoms of each element in a molecule of the compound. ### Next Steps: 1. Use the given mass percent composition to determine the mole ratio of the elements in the compound. 2. Calculate the empirical formula based on the simplest whole-number ratio. 3. Using the Ideal Gas Law and given conditions (temperature, pressure, volume, and mass), determine the molar mass. 4. Use the empirical formula and the molar mass to determine the molecular formula of the compound.
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