Answer
🧪 Mass Percent of Fluorine in KrF₂
Question:
What is the mass percent of fluorine (F) in the binary compound KrF₂?
Step-by-Step Explanation
The mass percent formula is:
Mass % = (Mass of F in KrF₂ / Molar mass of KrF₂) × 100Step 1: Molar Masses
- Krypton (Kr): 83.798 g/mol
- Fluorine (F): 18.998 g/mol
Step 2: Molar Mass of KrF₂
KrF₂ = 83.798 + 2 × 18.998 = 121.794 g/molStep 3: Mass of Fluorine
2 × 18.998 = 37.996 gStep 4: Mass Percent Calculation
(37.996 / 121.794) × 100 ≈ 31.20%✔ Final Answer: 31.20%
Summary Table
| Component | Amount in KrF₂ | Mass (g/mol) |
|---|---|---|
| Krypton (Kr) | 1 atom | 83.798 |
| Fluorine (F) | 2 atoms | 2 × 18.998 = 37.996 |
| Total Molar Mass | — | 121.794 |
| Mass % of Fluorine | — | 31.20% |