The molar mass of CaBr2 is 199.89 g/mol
The Correct Answer and Explanation is:
The molar mass of calcium bromide (CaBr2) is calculated by adding the molar masses of its constituent elements, calcium (Ca) and bromine (Br).
- Calcium (Ca) has an atomic mass of approximately 40.08 g/mol.
- Bromine (Br) has an atomic mass of approximately 79.90 g/mol. Since there are two bromine atoms in CaBr2, we need to multiply this atomic mass by 2.
Now, let’s calculate the molar mass of CaBr2:Molar mass of CaBr2=(Molar mass of Ca)+2×(Molar mass of Br)\text{Molar mass of CaBr2} = \text{(Molar mass of Ca)} + 2 \times \text{(Molar mass of Br)}Molar mass of CaBr2=(Molar mass of Ca)+2×(Molar mass of Br)Molar mass of CaBr2=40.08 g/mol+2×79.90 g/mol\text{Molar mass of CaBr2} = 40.08 \, \text{g/mol} + 2 \times 79.90 \, \text{g/mol}Molar mass of CaBr2=40.08g/mol+2×79.90g/molMolar mass of CaBr2=40.08 g/mol+159.80 g/mol\text{Molar mass of CaBr2} = 40.08 \, \text{g/mol} + 159.80 \, \text{g/mol}Molar mass of CaBr2=40.08g/mol+159.80g/molMolar mass of CaBr2=199.88 g/mol\text{Molar mass of CaBr2} = 199.88 \, \text{g/mol}Molar mass of CaBr2=199.88g/mol
So, the molar mass of CaBr2 is 199.88 g/mol, which rounds to 199.89 g/mol depending on the level of precision used.
This calculation is fundamental in stoichiometric calculations, where the molar mass helps determine the amount of substance in moles from a given mass or vice versa. The molar mass is also crucial in chemical reactions for balancing equations and determining limiting reactants.
