Acetonitrile (CH₃CN) is a polar organic solvent that dissolves a wide range of solutes, including many salts. The density of a 1.80 M LiBr solution in acetonitrile is 0.826 g/cm³. Calculate the concentration of the solution in (a) molality,

Video transcript

Hi everyone here we have a question telling us that the density of a 2.13 molar potassium chloride solution and is appropriate and all C three H 70. H. Is 0.786 g per centimeters cubed. What is the concentration of the solution in units of morality? So we have 2. moles per liter of potassium chloride. And that's because molinari d. Is moles per liter. So that means we have 2.13 moles a potassium chloride and one leader of our solution. So our mass a potassium cool ride Equals 2. moles a potassium chloride Times It's smaller mass. So .5513 g per one mole. And our moles here are canceling out. And that equals 158. 43 grams. So we have one liter of solution which equals 786 g of solution. Our mass of isopropanol Equals 786g of solution -158. grams. And that equals 627. g. And we want to change that to kg. So we're going to multiply by one kg Over 1000 g And our g are gonna cancel out. And that's gonna give us 0.6- two kg. So the morality of the solution Equals 2.13 moles over 0. kg. And that equals 3. morality. And that is our final answer. Thank you for watching bye!