Homework Answers
The vapor pressure of a liquid or solid is the equilibrium pressure of a vapour above its liquid (or solid); that is, the pressure of the vapor resulting from evaporation of a liquid (or solid) above a sample of the liquid (or solid) in a closed container. Examples:
| substance | vapor pressure at 25oC |
| diethyl ether | 0.7 atm |
| bromine | 0.3 atm |
| ethyl alcohol | 0.08 atm |
| water | 0.03 atm |
As the temperature of a liquid or solid increases its vapor pressure also increases. Conversely, vapor pressure decreases as the temperature decreases.
Naphthalene, C10H8, melts at 80.0 ˚C; the vapor pressure of the solid is 1.00 torr at 52.6 ˚C, and that of the liquid is...
Naphthalene, C10H8, melts at 80.0 ˚C; the vapor pressure of the solid is 1.00 torr at 52.6 ˚C, and that of the liquid is 10.0 torr at 85.8 ˚C and 40.0 torr at 119.3 ˚C. Calculate: (a) the enthalpy of vaporization, the normal boiling point, and the entropy of vaporization at the boiling point; (b) the vapor pressure at the melting point (Hint: liquid and solid are in equilibrium there)
Vapor pressure of a liquid is A. None of the above B. Total pressure exerted by...
Vapor pressure of a liquid is A. None of the above B. Total pressure exerted by the liquid molecules on the surface and the air on the container C. Pressure exerted by the vapor of the liquid in equilibrium with liquid molecules on the surface of the liquid D. Pressure exerted by air on the surface of the liquid E. Pressure exerted by the liquid molecules of the surface of the liquid on the air above its surface
The vapor pressure of a liquid is the pressure exerted by its vapor when the liquid...
The vapor pressure of a liquid is the pressure exerted by its vapor when the liquid and vapor states are in equilibrium. The relationship between vapor pressure P and temperature T is expressed by the Clausius-Clapeyron equation. lnP2P1=ΔHvapR(1T1−1T2) where P1 and P2 are the vapor pressures at the absolute temperatures T1 and T2, respectively, ΔHvap is the heat of vaporization of the substance in joules per mole, and R is the ideal gas constant, which is equal to 8.3145 J/(mol⋅K)....
Solid iodine has a vapor pressure of 1.0 mmHg at 39°C. How many moles of iodine...
Solid iodine has a vapor pressure of 1.0 mmHg at 39°C. How many moles of iodine will sublime into a 500. mL flask at this temperature? If the volume of the flask is doubled at constant temperature, what will happen to the equilibrium vapor pressure of I2? (Assume some solid I2 is always present in the container.)
Use the following vapor pressure data to answer the questions: Liquid Vapor Pressure, torr Temperature, °C...
Use the following vapor pressure data to answer the questions: Liquid Vapor Pressure, torr Temperature, °C A) C3H7OH 400torr, 82.0 C B) C2H5SH 400torr ,17.7 C (1) In which liquid are the intermolecular attractive forces the strongest ? (A or B?) (2) Which liquid would be expected to have the highest vapor pressure at 49.9 °C? (A or B?)
How is vapor pressure related to temperature? What happens to the vapor pressure of a substance...
How is vapor pressure related to temperature? What happens to the vapor pressure of a substance when the temperature is increased? Decreased? Check all that apply. The relationship between vapor pressure and temperature is not linear, but rather, it is exponential. The relationship between vapor pressure and temperature is linear. The vapor pressure of a liquid decreases with increasing temperature. The vapor pressure of a liquid increases with increasing temperature.
4. Liquid ammonia has a vapor pressure of 109 mm Hg at-66°C and a heat of...
4. Liquid ammonia has a vapor pressure of 109 mm Hg at-66°C and a heat of vaporization of 2.46 x 10 J/mol. a) Estimate the normal boiling point of ammonia. b) Estimate the ratio of the vapor pressure at -66°C to that at -45°C
4. Liquid ammonia has a vapor pressure of 109 mm Hg at-66°C and a heat of vaporization of 2.46 x 10 J/mol. a) Estimate the normal boiling point of ammonia. b) Estimate the ratio of the...
The vapor pressure of the liquid HF is measured at different temperatures. The following vapor pressure...
The vapor pressure of the liquid HF is measured at different temperatures. The following vapor pressure data are obtained: Temperature 270.6K and 287.5K, Pressure 324.5 mmHg and 626.9 mmHG. Calculate the enthapy of vaporization ( delta H vap ) in kJ/mol for this liquid.
What is the vap of a liquid that has a vapor pressure of 612 torr at...
What is the
vap of a liquid that has a vapor pressure of 612 torr at
84.6oC and a boiling point of 96.9oC at 1
atm?
At 300 K, the vapor pressure of pure liquid A and B is 200 mmHg and...
At 300 K, the vapor pressure of pure liquid A and B is 200 mmHg and 450 mmHg, respectively. If the total pressure of the mixture A and B is 350 mmHg and the assumption that the solution is ideal, calculate: (a) Mole fraction of A and B in liquid phase and vapor phase, (b) The activity and activity coefficient of A and B in the solution, and (c) The mixing free energy, Agm, and the mixing entropy, Asm, of...
4. Liquid ammonia has a vapor pressure of 109 mm Hg at-66°C and a heat of vaporization of 2.46 x 10 J/mol. a) Estimate the normal boiling point of ammonia. b) Estimate the ratio of the vapor pressure at -66°C to that at -45°C
4. Liquid ammonia has a vapor pressure of 109 mm Hg at-66°C and a heat of vaporization of 2.46 x 10 J/mol. a) Estimate the normal boiling point of ammonia. b) Estimate the ratio of the...
What is the
vap of a liquid that has a vapor pressure of 612 torr at
84.6oC and a boiling point of 96.9oC at 1
atm?
At 300 K, the vapor pressure of pure liquid A and B is 200 mmHg and 450 mmHg, respectively. If the total pressure of the mixture A and B is 350 mmHg and the assumption that the solution is ideal, calculate: (a) Mole fraction of A and B in liquid phase and vapor phase, (b) The activity and activity coefficient of A and B in the solution, and (c) The mixing free energy, Agm, and the mixing entropy, Asm, of...
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