To calculate the number of moles in 250.0 grams of KBr (potassium bromide), you need to know the molar mass of KBr, which is the sum of the atomic masses of potassium (K) and bromine (Br).
The atomic masses are:
- Potassium (K) = 39.10 g/mol
- Bromine (Br) = 79.90 g/mol
So, the molar mass of KBr is:
39.10 g/mol (K) + 79.90 g/mol (Br) = 119.00 g/mol
Now use the formula: moles = mass / molar mass
moles = 250.0 g / 119.00 g/mol = 2.10 moles
Therefore, there are 2.10 moles in 250.0 grams of KBr.
How many moles are in 250.0 grams of KBr?
1 answer