To calculate the molar mass of potassium bromide (KBr), you’ll need to know the atomic masses of potassium (K) and bromine (Br).
The atomic mass of potassium is approximately 39.10 g/mol, and the atomic mass of bromine is approximately 79.90 g/mol. Since potassium bromide consists of one potassium ion and one bromide ion, the molar mass calculation is straightforward:
- Molar mass of K = 39.10 g/mol
- Molar mass of Br = 79.90 g/mol
Now, add the two atomic masses together:
Molar mass of KBr = Molar mass of K + Molar mass of Br
Molar mass of KBr = 39.10 g/mol + 79.90 g/mol = 119.00 g/mol
Therefore, the molar mass of potassium bromide is 119.00 g/mol.