Answer:
[KI] = 0.25 M
Explanation:
Solute: KI
Mass of solute: 0.50 mol . 166 g / 1mol = 83 g
Our solution volume is 2L
Molarity is a kind of concentration, defined as the moles of solute contained in 1L of solution. It is the most common concentration for all solutions while there are any other kind, for example molality, mole fraction or ppm.
In this case molarity (mol/L) is 0.5 mol /2L = 0.25 M
In conclussion, solution is 0.25 molar whichs is the same to say, that 0.25 moles of potassium iodide are contained in 1L of solution.
With the data given, we can also make a rule of three:
2L of solution contain 0.5 moles of KI
Then, 1L of solution may contain (0.5 . 1) /2 = 0.25 moles of Ki