The formula for molarity is m=mol/L. Before substituting the values, you need to convert the given mass to moles.
The solution is: (25.0 g KBr) (1 mole/119.002 g KBr) = 0.21 mol KBr
Now, substitute this value to the formula for molarity.
0.21 mol KBr/0.750 L = 0.28 mol/L
The final answer is 0.28 mol/L.
