What Is the molar mass of Bre ? The atomic mass of bromine is 79.90 g/mol. 0 159.81 g/mol 0 253.80 g/mol 79.904 g/mol 0 2.11 * 10 22 g/mol 229.64 gmol
What Is the molar mass of Bre ? The atomic mass of bromine is 79.90 g/mol. 0 159.81 g/mol 0 253.80 g/mol 79.904 g/mol 0 2.11 * 10 22 g/mol 229.64 gmol
The Correct Answer and Explanation is:
The correct answer is: 159.81 g/mol
Explanation:
To determine the molar mass of Br₂ (bromine gas), we must understand what the formula Br₂ represents and how molar mass is calculated.
Step 1: Understanding Br₂
- The symbol Br stands for bromine, a halogen element.
- In nature, bromine exists as a diatomic molecule, which means two bromine atoms bond together to form a stable molecule: Br₂.
- This is similar to other diatomic elements like H₂, O₂, N₂, F₂, Cl₂, I₂.
Step 2: Atomic Mass of Bromine
- The atomic mass of a single bromine atom is given as 79.90 g/mol. This is the mass of one mole of Br atoms.
Step 3: Calculating the Molar Mass of Br₂
Since Br₂ contains two bromine atoms: Molar mass of Br2=2×atomic mass of Br=2×79.90 g/mol=159.80 g/mol\text{Molar mass of Br}_2 = 2 \times \text{atomic mass of Br} = 2 \times 79.90 \, \text{g/mol} = 159.80 \, \text{g/mol}
Given the closest option: 159.81 g/mol is the correct answer. The small rounding difference is acceptable due to rounding conventions in atomic mass tables.
Step 4: Why Other Answers Are Incorrect
- 253.80 g/mol: Too high; maybe confused with a heavier diatomic or triatomic molecule.
- 79.904 g/mol: Close to the atomic mass of a single Br atom, not Br₂.
- 2.11 × 10²² g/mol: Not a reasonable molar mass. This seems like a conversion from number of atoms, not appropriate for molar mass.
- 229.64 g/mol: Not a multiple of bromine’s atomic mass; likely an error or miscalculation.
Conclusion
Br₂ is a diatomic molecule of bromine, and since each Br atom has a mass of ~79.90 g/mol, the molar mass of Br₂ is 159.81 g/mol. This value is important in stoichiometric calculations involving bromine gas.
