a) What is the empirical formula of the compound, and An unknown compound is 2.11% B by mass. its molar mass? Percent to Mass Mass to Mole DJ A 2.251 g sample of the compound is dissolved in 347.0 mL of solution produces a 0.01267 M solution. What is the Molar Mass of the compound? c) What is the molecular formula of this compound? Divide by Small Multiple til whole!

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### Problem 5: Composition and Analysis of an Unknown Compound

**An unknown compound is composed of carbon, fluorine, and boron. Details are provided below:**

- **Carbon (C):** 42.23% by mass
- **Boron (B):** 2.11% by mass

**Tasks:**

a) **Determine the Empirical Formula:**
   - Calculate the empirical formula of the compound.
   - Identify its molar mass.

b) **Molar Mass Determination:**
   - A 2.251 g sample of the compound is dissolved in 347.0 mL of solution, resulting in a 0.01267 M solution.
   - Calculate the molar mass of the compound.

c) **Determine the Molecular Formula:**
   - Use the information from parts (a) and (b) to find the molecular formula of the compound.

**Guidelines:**

1. **Convert Percent to Mass:**
   - Assume 100 g of the compound for simplicity, so the given percentages can be directly treated as masses in grams.

2. **Convert Mass to Moles:**
   - Use atomic masses to convert the masses of each element to moles.

3. **Divide by the Smallest Number of Moles:**
   - Divide each element's molar quantity by the smallest molar quantity among the elements.

4. **Adjust to Whole Numbers:**
   - Multiply the resulting mole ratios by the smallest necessary factor to convert them to whole numbers, thereby determining the empirical formula.

**Illustration on the Right:**
- A simple flowchart in a rectangle is shown with steps:
  - Percent to Mass
  - Mass to Mole
  - Divide by Small
  - Multiply till whole

This systematic approach provides a structured methodology for solving the problem and accurately determining the empirical and molecular formulas from the given data.
Transcribed Image Text:### Problem 5: Composition and Analysis of an Unknown Compound **An unknown compound is composed of carbon, fluorine, and boron. Details are provided below:** - **Carbon (C):** 42.23% by mass - **Boron (B):** 2.11% by mass **Tasks:** a) **Determine the Empirical Formula:** - Calculate the empirical formula of the compound. - Identify its molar mass. b) **Molar Mass Determination:** - A 2.251 g sample of the compound is dissolved in 347.0 mL of solution, resulting in a 0.01267 M solution. - Calculate the molar mass of the compound. c) **Determine the Molecular Formula:** - Use the information from parts (a) and (b) to find the molecular formula of the compound. **Guidelines:** 1. **Convert Percent to Mass:** - Assume 100 g of the compound for simplicity, so the given percentages can be directly treated as masses in grams. 2. **Convert Mass to Moles:** - Use atomic masses to convert the masses of each element to moles. 3. **Divide by the Smallest Number of Moles:** - Divide each element's molar quantity by the smallest molar quantity among the elements. 4. **Adjust to Whole Numbers:** - Multiply the resulting mole ratios by the smallest necessary factor to convert them to whole numbers, thereby determining the empirical formula. **Illustration on the Right:** - A simple flowchart in a rectangle is shown with steps: - Percent to Mass - Mass to Mole - Divide by Small - Multiply till whole This systematic approach provides a structured methodology for solving the problem and accurately determining the empirical and molecular formulas from the given data.
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