The concentration unit of molality it symbolized as M m M mol mo Determine the m

Question

The concentration unit of molality it symbolized as M m M mol mo Determine the molal concentration of a sugar solution in water that has a freezing point of -2.1 degree C. K_t = 1.86 degree C/m for water. 1.13 m -1.13 m 3.91 m -3.91 m 0.113 m The normal temperature range of the liquid phase of pure water is 0 degree C to 100 degree C. Which of the following solutions will have the largest temperature range for the liquid state? 1 M aqueous ethanol solution 1 M aqueous potassium bromide solution 1 M aqueous acetic acid solution M aqueous magnesium bromide solution 1 M aqueous magnesium sulfate What would be the freezing point of a 1 m solution of HCI in water (K_t = 1.86 degree C)? 0.0 degree C -1.86 degree C -3.72 degree C 1.86 degree C -0.93 degree C A solution is made by dissolving 100 g of essentially nonvolatile ethylene glycol (C_2H_5O_2) in 500 g of water. What is the resulting freezing point of the solution (K_f = 1.86 degree C/m)? -5.99 degree C -1.86 degree C -0.372 degree C -1.61 degree C -3.23 degree C A newspaper article suggested using a fertilizer such as ammonium sulfate or ammonium nitrate to lower the melting point of ice on sidewalks because many of the deicing salts can damage law ns and sidewalks. Which of the following compounds would give the largest freezing point depression when 100 g of the compound are dissolved in I kg of solvent? NH_4NO_3(80.1 g/mol) (NH_4)_2SO_4(132.1 g/mol) MgSO_4(120.4 g/mol) CaCl_2(111.0 g/mol) MgCl_2(95.2 g/mol) What is the molality of a solution produced by dissolving 14.40 g of LiCI (42.39 g/mol) in water to make 0.104 L of solution with a density of 1.102 g/mL? 0.340 m 3.39 m 3.27 m 3.74 m 2.96 m Which of the following aqueous solutions will have the lowest freezing point? 0.1 m magnesium sulfate, MgSO_4 0.1 m potassium chloride, KCl 0.98 m magnesium chloride, MgCl_2 0.04 m sodium sulfate, Na_2SO_4 0.05 m sodium chloride, NaCl

Explanation / Answer

14. b) the concentration unit of molality is m

15. b) -1.13m . from Tf = Kf x M so we get M = -2.1/1.86

16. d) 1M solution of magnesium bromide

17. d) 1.86 from Tf= Kf X M

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