Question

Part A

A 45.8 −mL sample of a 7.8 M KNO3 solution is diluted to 1.20 L .

What volume of the diluted solution contains 17.0 g of KNO3?

Express your answer using two significant figures.

____=L

Part A

A sucrose solution is made using 156 g of sucrose (C12H22O11) and diluting to a total volume of 1.60 L .

Calculate the freezing point of the solution. (Assume a density of 1.06 g/mL for the final solution.)

Express your answer using three significant figures.

Tf=___ C  

Part B

Calculate the boiling point of the solution.

Express your answer using three decimal places.

Tb=___ C

Answer 1

Phon concentration of knco, after clilchan - 7.8% 45.2 1.2x1600 - 0.2977 let ut diluted solution is needed so moles or kHo₂ = Molarity, Volume - 0.2977x molar mass of Knog = 101 g/mol So mass- molexx molar maso a 0.29472 x 101 - - 17 0.9977x10! 17 - 0.565h = 0.561 PART Moles of suerose = 156 = 0.456 mole 34-2 mass of solution - 1.641 Doox 1.06 =16969 so, mass of solvent - 1696-156 = Molality (my = 0.456 1. 54 -0.2961 ATC - Krom - 1.86*0.2961 = 0.551 freezing point. -0.5sic PERTO AG- Kyim - 0.52x 0.2961 -0.154 15gog - |-54-5 try point = 100 to 154 = 100.154°c