what is the molar mass of Br2 in grams
The correct answer and explanation is:
Correct Answer:
The molar mass of Br₂ (bromine molecule) is 159.808 grams per mole (g/mol).
Explanation (300 words):
To find the molar mass of Br₂, we first need to understand what Br₂ represents. Br₂ is the diatomic molecule of bromine, meaning each molecule consists of two bromine (Br) atoms chemically bonded together.
Step-by-step Calculation:
- Find the atomic mass of one bromine (Br) atom:
- The atomic mass of bromine is approximately 79.904 g/mol. This value is based on the average mass of all naturally occurring isotopes of bromine, as found on the periodic table.
- Multiply by 2 (since Br₂ has 2 atoms of Br): Molar mass of Br₂=2×79.904=159.808 g/mol\text{Molar mass of Br₂} = 2 \times 79.904 = 159.808 \, \text{g/mol}
This result tells us that one mole of Br₂ molecules weighs 159.808 grams.
Why This Is Important:
In chemistry, the molar mass is essential for converting between grams and moles, which is crucial for understanding chemical reactions. When a chemical reaction involves bromine (Br₂), we use its molar mass to determine:
- How much bromine is needed (in grams) to react with another substance.
- How many moles of Br₂ are present in a given mass of the substance.
Example Use:
If you have 31.96 grams of Br₂ and want to know how many moles you have, you would use: Moles of Br₂=31.96 g159.808 g/mol≈0.2 mol\text{Moles of Br₂} = \frac{31.96 \, \text{g}}{159.808 \, \text{g/mol}} \approx 0.2 \, \text{mol}
In summary, the molar mass of Br₂ is 159.808 g/mol, and knowing this allows chemists to perform accurate calculations in stoichiometry and laboratory work.