Homework Answers
Ans according to trouton's rule
Delta H / Tb = 10.5 R
Tb = 12000 / ( 10.5 * 8.314)
Tb = 137.46K
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Liquid nitrogen can be used to cool down objects. The following data of liquid nitrogen and...
1) The vapor pressure of liquid antimony is 400 mm Hg at 1.84×103 K. Assuming that its molar heat of vaporization is con...
1) The vapor pressure of liquid antimony is 400 mm Hg at 1.84×103 K. Assuming that its molar heat of vaporization is constant at 115 kJ/mol, the vapor pressure of liquid Sb is _____ mm Hg at a temperature of 1.81×103 K. 2) The normal boiling point of liquid acetone is 329 K. Assuming that its molar heat of vaporization is constant at 29.0 kJ/mol, the boiling point of CH3COCH3 when the external pressure is 1.21 atm is ______ K.
Question 5 1 pts Liquid nitrogen is needed in a number of medical applications, such as...
Question 5 1 pts Liquid nitrogen is needed in a number of medical applications, such as removing tumors during cryosurgery. Gaseous N2 at room temperature (298K) is cooled to liquid N2 just below its boiling point. N2 liquefies at 77K. The specific enthalpy to cool N2 from 298K to 77K is -1435 cal/mol. The heat of vaporization (i.e., the specific enthalpy change from the liquid to the vapor form) of nitrogen is 1336 cal/mol. The overall change in its specific...
Liquid nitrogen is often used as an effective coolant, as its boiling temperature is far below...
Liquid nitrogen is often used as an effective coolant, as its boiling temperature is far below the freezing temperature of water. Specifically, the boiling point of liquid nitrogen is 77.0 K. A 0.650-kg block of iron at an initial temperature of 293.15 K is immersed in an insulated bath of liquid nitrogen with an initial temperature of 77.0 K. After the iron and the liquid nitrogen reach a state of thermal equilibrium, the iron block has cooled to a final...
Review Constants Pe Consider the following two substances and their vapor pressures at 298 K All...
Review Constants Pe Consider the following two substances and their vapor pressures at 298 K All liquids evaporate to a certain extent. The pressure exerted by the gas phase in equilibrium with the liquid is called vapor pressure. Prap. The vapor pressure of a particular substance is determined by the strength of the intermolecular forces. But for any given substance, the vapor pressure only changes with temperature. The Clausius-Clapeyron equation expresses the relationship between vapor pressure and temperature: Substance Vapor...
This is physical chemistry problem from Atkins 5. [20 (1) The variation of chemical potential, u...
This is physical chemistry problem from
Atkins
5. [20 (1) The variation of chemical potential, u of a perfect gas with pressure can be expressed as follows: Au RT ln Derive the below equation for Gibbs energy of mixing, when two gases of A and B are mixed at constant pressure, p and temperature, T. (2) Calculate the molar Gibbs energy of mixing when the two major components of air (nitrogen and oxygen) are mixed to form air at 298...
1. Liquid nitrogen at −196° C (nitrogen’s boiling point) is placed in a container with 3...
1. Liquid nitrogen at −196° C (nitrogen’s boiling point) is placed in a container with 3 kg of water at 25° C. (a) Suppose you add just enough liquid nitrogen such that all the water just freezes (i.e., the final state of the water is ice at 0° C). Draw a complete energy interaction diagram for this scenario, including a conservation of energy equation. (b) How much liquid nitrogen should you put in the container such that all the water...
When the pressure P is constant at 1 atm, the melting point of Br_2 is T_m...
When the pressure P is constant at 1 atm, the melting point of Br_2 is T_m = 265.95 K and its boiling point is T_b = 331.85 K. Br_2 is therefore liquid at 298 K and 1 atm but it also has a finite vapor pressure hence the property of both liquid and gas Br_2 can be obtained at at 298 K and 1 atm. Using a DeHoff equation and the thermodynamic table on D2L calculate the absolute molar entropy...
P2) (50 pts.) The boiling temperature of nitrogen at atmospheric pressure at sea level (1 atm pre...
P2) (50 pts.) The boiling temperature of nitrogen at atmospheric pressure at sea level (1 atm pressure) is -196°C. Therefore, nitrogen is commonly used in low-temperature scientific studies, since the temperature of liquid nitrogen in a tank open to the atmosphere will remain constant at -196°C until it is depleted. Any heat transfer to the tank will result in the evaporation of some liquid nitrogen, which has a heat of vaporization of 198 kJ/kg and a density of 810 kg/m3...
Question 11 (1 point) The solubility of nitrogen gas in water at 25 °C is 6.8x104...
Question 11 (1 point) The solubility of nitrogen gas in water at 25 °C is 6.8x104 mol / (L'atm). If the partial pressure of nitrogen gas is (1.60x10*0) atm, what is the concentration (molarity) of dissolved nitrogen? Report to 3 significant figures. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Answer Save Question 12 (1 point) The fluorocarbon C2CI3F3 has a normal boiling point of 476 °C The specific heats of C2C13F3D...
The boiling temperature of nitrogen at atmospheric pressure at sea level (1 atm pressure) is -196°C. Therefore, nitroge...
The boiling temperature of nitrogen at atmospheric pressure at sea level (1 atm pressure) is -196°C. Therefore, nitrogen is commonly used in low-temperature scientific studies since the temperature of liquid nitrogen in a tank open to the atmosphere will remain constant at -196°C until it is depleted. Any heat transfer to the tank will result in the evaporation of some liquid nitrogen, which has a heat of vaporization of 198 kJ/kg and a density of 810 kg/m3 at 1 atm....
Question 5 1 pts Liquid nitrogen is needed in a number of medical applications, such as removing tumors during cryosurgery. Gaseous N2 at room temperature (298K) is cooled to liquid N2 just below its boiling point. N2 liquefies at 77K. The specific enthalpy to cool N2 from 298K to 77K is -1435 cal/mol. The heat of vaporization (i.e., the specific enthalpy change from the liquid to the vapor form) of nitrogen is 1336 cal/mol. The overall change in its specific...
Liquid nitrogen is often used as an effective coolant, as its boiling temperature is far below the freezing temperature of water. Specifically, the boiling point of liquid nitrogen is 77.0 K. A 0.650-kg block of iron at an initial temperature of 293.15 K is immersed in an insulated bath of liquid nitrogen with an initial temperature of 77.0 K. After the iron and the liquid nitrogen reach a state of thermal equilibrium, the iron block has cooled to a final...
Review Constants Pe Consider the following two substances and their vapor pressures at 298 K All liquids evaporate to a certain extent. The pressure exerted by the gas phase in equilibrium with the liquid is called vapor pressure. Prap. The vapor pressure of a particular substance is determined by the strength of the intermolecular forces. But for any given substance, the vapor pressure only changes with temperature. The Clausius-Clapeyron equation expresses the relationship between vapor pressure and temperature: Substance Vapor...
This is physical chemistry problem from
Atkins
5. [20 (1) The variation of chemical potential, u of a perfect gas with pressure can be expressed as follows: Au RT ln Derive the below equation for Gibbs energy of mixing, when two gases of A and B are mixed at constant pressure, p and temperature, T. (2) Calculate the molar Gibbs energy of mixing when the two major components of air (nitrogen and oxygen) are mixed to form air at 298...
When the pressure P is constant at 1 atm, the melting point of Br_2 is T_m = 265.95 K and its boiling point is T_b = 331.85 K. Br_2 is therefore liquid at 298 K and 1 atm but it also has a finite vapor pressure hence the property of both liquid and gas Br_2 can be obtained at at 298 K and 1 atm. Using a DeHoff equation and the thermodynamic table on D2L calculate the absolute molar entropy...
P2) (50 pts.) The boiling temperature of nitrogen at atmospheric pressure at sea level (1 atm pressure) is -196°C. Therefore, nitrogen is commonly used in low-temperature scientific studies, since the temperature of liquid nitrogen in a tank open to the atmosphere will remain constant at -196°C until it is depleted. Any heat transfer to the tank will result in the evaporation of some liquid nitrogen, which has a heat of vaporization of 198 kJ/kg and a density of 810 kg/m3...
Question 11 (1 point) The solubility of nitrogen gas in water at 25 °C is 6.8x104 mol / (L'atm). If the partial pressure of nitrogen gas is (1.60x10*0) atm, what is the concentration (molarity) of dissolved nitrogen? Report to 3 significant figures. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Answer Save Question 12 (1 point) The fluorocarbon C2CI3F3 has a normal boiling point of 476 °C The specific heats of C2C13F3D...
The boiling temperature of nitrogen at atmospheric pressure at sea level (1 atm pressure) is -196°C. Therefore, nitrogen is commonly used in low-temperature scientific studies since the temperature of liquid nitrogen in a tank open to the atmosphere will remain constant at -196°C until it is depleted. Any heat transfer to the tank will result in the evaporation of some liquid nitrogen, which has a heat of vaporization of 198 kJ/kg and a density of 810 kg/m3 at 1 atm....
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