Question 5/10 Which of the following solutions will have the largest freezing point depression? Choose an answer 1.5 m fructose 0.75 m fructose 0.25 m fructose 0.1 m fructose Points 1 Question 6/10 The freezing point of a solution was lowered to -3.50 °C when 55 g of nonelectrolyte compound was dissolved in 950 g of water. Find the molecular weight of a nonelectrolyte compound, in g/mol. Choose an answer 30.76 3076 307.6 123.5 Points 1 Question 7/10 What is the freezing point of a 3.75 m solution of a nonvolatile, nonelectrolyte solute in water? Choose an answer 100.69 °C -6.98 °C 6.98 °C -100.69 °C Points 1 Question 8/10 Fill in the blank. Compared to the pure solvent, the freezing point of a solution is __________. Choose an answer increased because the solution has higher osmotic pressure. increased because of the lowered vapor pressure. decreased because the solution freezes at a lower temperature than the solvent. decreased because the dissolved solute raises the vapor pressure. Points 1
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Question 5/10: The freezing point depression is directly proportional to the molality of the solution. Show more…
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5) Which of the following solutions will have a lower freezing point: saltwater (made with 10 moles of salt in 1 kg of water) or sugar water (made with 10 moles of sugar in 1 kg of water)? a) They will be exactly the same since they have the same number of moles of solutes b) It depends on the weight of each solute c) The saltwater d) The sugar water 6) In what part of the graph will you be able to detect the freezing point of the solution? a) the nearly horizontal portion b) none of the above c) the top slope d) the bottom slope 7) The equation for freezing point depression includes the molality of the solution. Which of these accurately describes a one molal solution? a) one formula weight (in grams) of a solute dissolved in one liter of solvent b) one mole of solute dissolved in one liter of solvent c) 1 M d) one mole of solute dissolved in one kilogram of solvent 8) Which observation(s) reflect(s) colligative properties? (I) A 0.5 m NaBr solution has a higher vapor pressure than a 0.5 m BaCl2 solution. (II) A 0.5 m NaOH solution freezes at a lower temperature than pure water. (III) Pure water freezes at a higher temperature than pure methanol. a) I and III b) only I c) only II d) only III e) I and II
Hitendra S.
a) The normal freezing point of water, H2O, is 0.00 °C and its Kfp value is 1.86 °C/m. A nonvolatile, nonelectrolyte that dissolves in water is sucrose. If 10.04 grams of sucrose, C12H22O11 (342.3 g/mol), are dissolved in 277.5 grams of water: The molality of the solution is ___________ m. The freezing point of the solution is _____________ °C. b) The normal freezing point of benzene (C6H6) is 5.50 °C and its Kfp value is 5.12 °C/m. A nonvolatile, nonelectrolyte that dissolves in benzene is cholesterol. How many grams of cholesterol, C27H46O (386.6 g/mol), must be dissolved in 247.0 grams of benzene to reduce the freezing point by 0.450 °C? _________ g cholesterol. c) The boiling point of diethyl ether, CH3CH2OCH2CH3 is 34.50 °C at 1 atmosphere and its Kbp value is 2.02 °C/m. A nonvolatile, nonelectrolyte that dissolves in diethyl ether is DDT. How many grams of DDT, C14H9Cl5 (354.5 g/mol), must be dissolved in 264.0 grams of diethyl ether to raise the boiling point by 0.350 °C? ____g DDT.
Raghvendra S.
1. Suppose that you add 21.1 g of an unknown molecular compound to 0.250 kg of benzene, which has a Kf of 5.12 °C/m. With the added solute, you find that there is a freezing point depression of 3.71 °C compared to pure benzene. What is the molar mass (in g/mol) of the unknown compound? 2. Ethyl propanoate is an organic molecule that smells like pineapple and has a molar mass of 102.132 g/mol. It is soluble in the organic solvent acetone. What is the molality of a solution prepared with 87.8 g of ethyl propanoate and 505.9 mL of acetone? The density of acetone is 0.784 g/mL. 3. What is the freezing point (in degrees Celsius) of 4.30 kg of water if it contains 196.9 g of butanol, C4H9OH? The freezing point depression constant for water is 1.86 °C/m and the molar mass of butanol is 74.12 g/mol.
Dinesh S.
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