336
Colligative Properties
of camphor and 7 32 mg of an unknown compound, and finds the melting point
to be 159 3°C The melting point of the camphor before mixing was 175 1°C
What is the mole weight of the compound
17
6 When 2 848 g of sulfur is dissolved in 50 0 ml of CS 2 (density = 1 263 g/ml),
the solution boils at a temperature 0 411°C higher than the pure CS 2 What is
the molecular formula of sulfur*
7
1 When 0 532 g of a certain solid organic compound is dissolved in 16 8 g of
urethane, whose freezing point is 49 50°C, the freezing point of the solution is
lowered to 48 32°C Chemical analysis shows this compound to be 69 5% C,
7 25% H, and 23 25% O Determine the true formula of this compound
SAO 356 g sample of a solid organic compound, when dissolved in 9 15 ml of
carbon tetrachlonde (density = 1 595 g/ml), raises the boiling point of the
carbon tetrachlonde by 0 560°C When analyzed, this compound is found to
be 55 0% C, 2 75% H, 12 8% N, and 29 4% O What is the true formula of this
compound
9
9 Old United States silver coins, which are 10 0% Cu in Ag, melt completely at
875 0°C, pure silver melts at 960 0°C What is the molal freezing-point constant for Ag
9
10 Calculate the mole fraction and the molallty of the first-named component in
each of the following solutions
(a) 10 0% solution of glycerine, C 3 H 8 O 3 , in water
(b) 5 0% solution of water in acetic acid
(c) 5 0 g CCL, and 25 g of C 2 H 5 OH
(d) 0 10 g CN 2 H 4 O in 5 0 g of water
(e) 8 00 g CH,OH in 57 0 g C 6 H 6
11 How many quarts of ethylene glycol, C 2 H h O 2 (density = 1 116 g/ml), will
have to be added to 5 0 gal of water (density = 1 00 g/ml) to protect an
automobile radiator down to a temperature of 10 0°F
9 (Ethylene glycol is a
permanent ' antifreeze agent )
12 A beaker containing 100 g of 10 0% sucrose (C 12 H 22 O U ) solution and another
containing 150 g of a 30 0% sucrose solution are put under a bell jar at 25 0°C
and allowed to stand until equilibrium is attained What weight of solution will
each beaker contain when equilibrium has been reached
9
13 By how many torr will the vapor pressure of water at 27 0°C be lowered if 50 0
g of urea, CH 4 N 2 O, are dissolved in 50 0 g of water
9
14 A carbon-hydrogen-oxygen analysis of benzoic acid gives 68 8% C, 5 0% H,
26 2% O AO 1506 g sample of benzoic acid dissolved in 100 g of water gives a
solution whose freezing point is -0 023°C A 2 145 g sample of benzoic acid in
50 0 g of benzene, C 6 H 6 , gives a solution whose freezing point is 4 58°C The
freezing point of the pure benzene is 5 48°C Determine the molecular formula
for benzoic acid in these two solutions, and explain any difference observed
15 A 75 0 g sample of glucose, C 6 H 12 O 6 , is dissolved in 250 g of water at 27 0°C
What will be the osmotic pressure of the solution
9
Colligative Properties
of camphor and 7 32 mg of an unknown compound, and finds the melting point
to be 159 3°C The melting point of the camphor before mixing was 175 1°C
What is the mole weight of the compound
17
6 When 2 848 g of sulfur is dissolved in 50 0 ml of CS 2 (density = 1 263 g/ml),
the solution boils at a temperature 0 411°C higher than the pure CS 2 What is
the molecular formula of sulfur*
7
1 When 0 532 g of a certain solid organic compound is dissolved in 16 8 g of
urethane, whose freezing point is 49 50°C, the freezing point of the solution is
lowered to 48 32°C Chemical analysis shows this compound to be 69 5% C,
7 25% H, and 23 25% O Determine the true formula of this compound
SAO 356 g sample of a solid organic compound, when dissolved in 9 15 ml of
carbon tetrachlonde (density = 1 595 g/ml), raises the boiling point of the
carbon tetrachlonde by 0 560°C When analyzed, this compound is found to
be 55 0% C, 2 75% H, 12 8% N, and 29 4% O What is the true formula of this
compound
9
9 Old United States silver coins, which are 10 0% Cu in Ag, melt completely at
875 0°C, pure silver melts at 960 0°C What is the molal freezing-point constant for Ag
9
10 Calculate the mole fraction and the molallty of the first-named component in
each of the following solutions
(a) 10 0% solution of glycerine, C 3 H 8 O 3 , in water
(b) 5 0% solution of water in acetic acid
(c) 5 0 g CCL, and 25 g of C 2 H 5 OH
(d) 0 10 g CN 2 H 4 O in 5 0 g of water
(e) 8 00 g CH,OH in 57 0 g C 6 H 6
11 How many quarts of ethylene glycol, C 2 H h O 2 (density = 1 116 g/ml), will
have to be added to 5 0 gal of water (density = 1 00 g/ml) to protect an
automobile radiator down to a temperature of 10 0°F
9 (Ethylene glycol is a
permanent ' antifreeze agent )
12 A beaker containing 100 g of 10 0% sucrose (C 12 H 22 O U ) solution and another
containing 150 g of a 30 0% sucrose solution are put under a bell jar at 25 0°C
and allowed to stand until equilibrium is attained What weight of solution will
each beaker contain when equilibrium has been reached
9
13 By how many torr will the vapor pressure of water at 27 0°C be lowered if 50 0
g of urea, CH 4 N 2 O, are dissolved in 50 0 g of water
9
14 A carbon-hydrogen-oxygen analysis of benzoic acid gives 68 8% C, 5 0% H,
26 2% O AO 1506 g sample of benzoic acid dissolved in 100 g of water gives a
solution whose freezing point is -0 023°C A 2 145 g sample of benzoic acid in
50 0 g of benzene, C 6 H 6 , gives a solution whose freezing point is 4 58°C The
freezing point of the pure benzene is 5 48°C Determine the molecular formula
for benzoic acid in these two solutions, and explain any difference observed
15 A 75 0 g sample of glucose, C 6 H 12 O 6 , is dissolved in 250 g of water at 27 0°C
What will be the osmotic pressure of the solution
9