Please help with this question, I would appreciate if you could explain your work where it needs explaining.

Question

What is the molarity of a solution composed of 5. 85 g of potassium iodide. KI, dissolved in enough water to make 0.125 L of solution?

Answer 1

Molarity is expressed as moles of solute per liter of solution. We are given the liters of solution as 0.125, so now we must find the moles of solute.

KI has a molar mass of 166 g/mole

5.85 g KI x 1 mol KI / 166 g = 0.0352 moles KI

Molarity = 0.0352 moles/0.125 L = 0.282 M (3 sig. figs.)