Homework Answers
According to troutons law Standard Molar entropy = 10.5R = 87J/mol/K
Entropy of vapourization = Enthalpy of vapourization/boiling temperature = 40.7/373 = 0.11 kJ = 110J
Water does not obey Troutons law. This is an exception to the troutons rule. Because of hydrogen bonding in water in the liquid phase entropy is low compared to the gas phase.
Boiling point of CCl2F2 = 243.21K
Standar heat capacity = 20.2 kJ/mole
Standard molar entropy = 20.2/243.21 = 83.055kJ/mole/K
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2. A useful generalization known as the Trouton's rule states that, for many non-associated liquids at...
Trouton's rule states that the molar enthalpy of vaporization of a liquid that does not have...
Trouton's rule states that the molar enthalpy of vaporization of a liquid that does not have strong molecular interactions such as hydrogen bonding or ion-ion attractions is given by Boiling Chemical Compound formula AH yap (kJ-moll) point Hus (kJ.mol-) (K) chloromethane CH CI 21.40 249.06 6.43 water HO 40.65 373.15 6.01 hydrogen H,S 18.67 213.60 18.67 sulfide A Hvap = (85J.K-. mol-?)T where T, is the normal boiling point of the liquid in kelvins. Apply Trouton's rule to estimate the...
Scientists wished to determine the heat of formation of gaseous ethanol (C2H5 OH). Known was the...
Scientists wished to determine the heat of formation of gaseous ethanol (C2H5 OH). Known was the heat of formation of liquid ethanol (-277 kJ/mol) as well as the standard entropy of formation of liquid ethanol (159.9 J/molK) Please help out the scientists (that is negative 5170) when InPvap was plotted against Measurements of Pvap (T) produced a slope of -5170K 1/T (with T in Kelvin) Compute the AH of vaporization and then use your appendix to compute the heat of...
Phase transitions are similar to chemical reactions in that they each have an associated entropy change....
Phase transitions are similar to chemical reactions in that they
each have an associated entropy change. A phase transition involves
the breaking or forming of intermolecular attractive forces.
A change in entropy accompanies not only a variation in the
temperature, pressure, or volume of a system but also a physical
transformation such as the fusion, vaporization, or transition from
one crystalline state into another.
In the equilibrium between two phases, the exchange of heat can
be carried out reversibly, and...
Three liquids have the following properties: Water Propanone Pentane Molecular Formula H20 C3H60 C5H12 Molar mass...
Three liquids have the following properties: Water Propanone Pentane Molecular Formula H20 C3H60 C5H12 Molar mass in g/mol 18 58 72 Enthalpy vaporization in kJ/mol 41.1 31.9 27.7 Boiling point in °C 10056 36 What type of intermolecular force predominates in each liquid? Water Propanone Pentane
The vapor pressure of Y is 4.590 atm at 330K and 9.180 atm at 380K. What...
The vapor pressure of Y is 4.590 atm at 330K and 9.180 atm at 380K. What are the standard free energies of vaporization at the two temperatures? Hint: vaporization reaction is Y(I) = Y(g). AG330º = kJ/mol AG380º = kJ/mol Assume that the standard entropy and enthalpy of vaporization of Y are independent of temperature and determine their values ASO = J/(mol-K) AH = kJ/mol What is the normal boiling point of Y in degrees Celcius? t = Ос What...
The vapor pressure of Y is 2.320 atm at 420K and 5.336 atm at 478K. What...
The vapor pressure of Y is 2.320 atm at 420K and 5.336 atm at 478K. What are the standard free energies of vaporization at the two temperatures? Hint: vaporization reaction is Y(u) - Y(9). kJ/mol AG420º = AG478° - kJ/mol Assume that the standard entropy and enthalpy of vaporization of Y are independent of temperature and determine their values 3/(mol-K) AS- AH kJ/mol What is the normal boiling point of Y in degrees Celclus? oc What is the vapor pressure...
The vapor pressure of Y is 4.050 atm at 290K and 13.365 atm at 373K. What...
The vapor pressure of Y is 4.050 atm at 290K and 13.365 atm at 373K. What are the standard free energies of vaporization at the two temperatures? Hint: vaporization reaction is Y(I) = Y(g). «J/mol AG290º = AG373° = kJ/mol Assume that the standard entropy and enthalpy of vaporization of Y are independent of temperature and determine their values J/(mol-K) AS° = AH° = kJ/mol What is the normal boiling point of Y in degrees Celcius? 1 t= t =...
Sample problems 3: How does the entropy of the system change when the following occur: a)...
Sample problems 3: How does the entropy of the system change when the following occur: a) a so vaporizes; ce) a solid dissolves in water; d) a gas liquefies? as 2. The normal boiling point of methanol (CHsOH) is 64.7 Co, and its molar enthalpy of vaporization is Hap -71.8 kJ/mol. A) When CHoOH 1) boils at its normal boiling point, does its entropy increase or decrease? B) Calculate the value of AS when 1.00 mol of CHOH() is vaporized...
16. The total entropy of a system and its surroundings always increases for a spontan process. Th...
16. The total entropy of a system and its surroundings always increases for a spontan process. This is a statement of A) the law of constant composition. B) the first law of thermodynamics. C) the second law of thermodynamics. D) the third law of thermodynamics. the law of conservation of matter. 17. The standard enthalpy of vaporization of chloroform is 29.2 kJ/mol at its normal point, 61.2°C. What is the standard change in entropy for the vaporization of chloroform at...
The vapor pressure of Y is 1.620 atm @ 200K and 4.698 atm @ 273K. What...
The vapor pressure of Y is 1.620 atm @ 200K and 4.698 atm @
273K. What are the standard free energies of vaporization
temperatures? Hint: vaporization reaction is Y(l) = Y(g)
(at 200K)
(at 273K)
Assume that the standard entropy and enthalpy of vaporization of
Y are independent of temperature and determine their values.
(Delta S degrees)
(Delta H degrees)
What is the normal boiling point of Y in degrees Celcius?
t= ? degrees Celsius
What is the vapor pressure...
Trouton's rule states that the molar enthalpy of vaporization of a liquid that does not have strong molecular interactions such as hydrogen bonding or ion-ion attractions is given by Boiling Chemical Compound formula AH yap (kJ-moll) point Hus (kJ.mol-) (K) chloromethane CH CI 21.40 249.06 6.43 water HO 40.65 373.15 6.01 hydrogen H,S 18.67 213.60 18.67 sulfide A Hvap = (85J.K-. mol-?)T where T, is the normal boiling point of the liquid in kelvins. Apply Trouton's rule to estimate the...
Scientists wished to determine the heat of formation of gaseous ethanol (C2H5 OH). Known was the heat of formation of liquid ethanol (-277 kJ/mol) as well as the standard entropy of formation of liquid ethanol (159.9 J/molK) Please help out the scientists (that is negative 5170) when InPvap was plotted against Measurements of Pvap (T) produced a slope of -5170K 1/T (with T in Kelvin) Compute the AH of vaporization and then use your appendix to compute the heat of...
Phase transitions are similar to chemical reactions in that they
each have an associated entropy change. A phase transition involves
the breaking or forming of intermolecular attractive forces.
A change in entropy accompanies not only a variation in the
temperature, pressure, or volume of a system but also a physical
transformation such as the fusion, vaporization, or transition from
one crystalline state into another.
In the equilibrium between two phases, the exchange of heat can
be carried out reversibly, and...
Three liquids have the following properties: Water Propanone Pentane Molecular Formula H20 C3H60 C5H12 Molar mass in g/mol 18 58 72 Enthalpy vaporization in kJ/mol 41.1 31.9 27.7 Boiling point in °C 10056 36 What type of intermolecular force predominates in each liquid? Water Propanone Pentane
The vapor pressure of Y is 4.590 atm at 330K and 9.180 atm at 380K. What are the standard free energies of vaporization at the two temperatures? Hint: vaporization reaction is Y(I) = Y(g). AG330º = kJ/mol AG380º = kJ/mol Assume that the standard entropy and enthalpy of vaporization of Y are independent of temperature and determine their values ASO = J/(mol-K) AH = kJ/mol What is the normal boiling point of Y in degrees Celcius? t = Ос What...
The vapor pressure of Y is 2.320 atm at 420K and 5.336 atm at 478K. What are the standard free energies of vaporization at the two temperatures? Hint: vaporization reaction is Y(u) - Y(9). kJ/mol AG420º = AG478° - kJ/mol Assume that the standard entropy and enthalpy of vaporization of Y are independent of temperature and determine their values 3/(mol-K) AS- AH kJ/mol What is the normal boiling point of Y in degrees Celclus? oc What is the vapor pressure...
The vapor pressure of Y is 4.050 atm at 290K and 13.365 atm at 373K. What are the standard free energies of vaporization at the two temperatures? Hint: vaporization reaction is Y(I) = Y(g). «J/mol AG290º = AG373° = kJ/mol Assume that the standard entropy and enthalpy of vaporization of Y are independent of temperature and determine their values J/(mol-K) AS° = AH° = kJ/mol What is the normal boiling point of Y in degrees Celcius? 1 t= t =...
Sample problems 3: How does the entropy of the system change when the following occur: a) a so vaporizes; ce) a solid dissolves in water; d) a gas liquefies? as 2. The normal boiling point of methanol (CHsOH) is 64.7 Co, and its molar enthalpy of vaporization is Hap -71.8 kJ/mol. A) When CHoOH 1) boils at its normal boiling point, does its entropy increase or decrease? B) Calculate the value of AS when 1.00 mol of CHOH() is vaporized...
16. The total entropy of a system and its surroundings always increases for a spontan process. This is a statement of A) the law of constant composition. B) the first law of thermodynamics. C) the second law of thermodynamics. D) the third law of thermodynamics. the law of conservation of matter. 17. The standard enthalpy of vaporization of chloroform is 29.2 kJ/mol at its normal point, 61.2°C. What is the standard change in entropy for the vaporization of chloroform at...
The vapor pressure of Y is 1.620 atm @ 200K and 4.698 atm @
273K. What are the standard free energies of vaporization
temperatures? Hint: vaporization reaction is Y(l) = Y(g)
(at 200K)
(at 273K)
Assume that the standard entropy and enthalpy of vaporization of
Y are independent of temperature and determine their values.
(Delta S degrees)
(Delta H degrees)
What is the normal boiling point of Y in degrees Celcius?
t= ? degrees Celsius
What is the vapor pressure...
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