0.071- 13.9 14.0 20.3 33.2 T Kelvin (a) What is the normal melting point? K The normal boiling point? K (b) At what temperature and pressure do the three phases coexist in equilibrium? T = (c) Is hydrogen a solid, a liquid or a gas at room temperature and pressure? Ө (d) Which is the more dense phase, the liquid or the solid? K, P = atm (e) A 49.9 g sample of liquid hydrogen is heated at a constant pressure of 1 atm from a temperature of 20.3 K to a temperature of 72.1 K. How much energy in kJ is required? kj Answer the following questions based on the phase diagram (not to scale!) for hydrogen, H2, and on the following data: 58.4 J/g, AH vap = 452 J/g, specific heat gas = 14.3 J/g.K AH fusion 12.8 P 1.00 atm 0.071- 13.9 14.0 20.3 33.2 T Kolvin (a) What is the normal melting point? K The normal boiling point? K (b) At what temperature and pressure do the three phases coexist in equilibrium? T = K, P = atm

0.071- 13.9 14.0 20.3 33.2 T Kelvin (a) What is the normal melting point? K The normal boiling point? K (b) At what temperature and pressure do the three phases coexist in equilibrium? T = (c) Is hydrogen a solid, a liquid or a gas at room temperature and pressure? Ө (d) Which is the more dense phase, the liquid or the solid? K, P = atm (e) A 49.9 g sample of liquid hydrogen is heated at a constant pressure of 1 atm from a temperature of 20.3 K to a temperature of 72.1 K. How much energy in kJ is required? kj Answer the following questions based on the phase diagram (not to scale!) for hydrogen, H2, and on the following data: 58.4 J/g, AH vap = 452 J/g, specific heat gas = 14.3 J/g.K AH fusion 12.8 P 1.00 atm 0.071- 13.9 14.0 20.3 33.2 T Kolvin (a) What is the normal melting point? K The normal boiling point? K (b) At what temperature and pressure do the three phases coexist in equilibrium? T = K, P = atm

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter9: Liquids, Solids, And Materials

Section9.2: Vaporization And Condensation

Problem 9.2PSP: What mass (g) of ethanol, CH3CH2OH(), can be vaporized at its boiling point of 78.4 C by transfer of...

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What mass (g) of ethanol, CH3CH2OH(), can be vaporized at its boiling point of 78.4 C by transfer of 500. kJ to the liquid? The vapH of ethanol is 38.6 kJ/mol at this temperature.
Define the joule in terms of SI base units.
What would be the equilibrium temperature if you drop 5.0 g of brass (Cp= 0.38 J/g-°C, initially at 68°C) and 3.5 g of aluminum (Cp = 0.9 J/g-°Cinitially at 83°C) into 105 g of water (Cp = 4.184 J/g-°C,initially at 23°C)?
What is the boiling point of water in a pressure cookerwith a pressure of 2.00 atm? (The enthalpy ofvaporization of water is 40.7 kJ mol–1.)(A) 101 °C (B) 121 °C (C) 141 °C (D) 200 °C
(c) Is methane a solid, liquid, or gas at 1 atm and 0 °C? (d) If solid methane at 1 atm is heated while the pressure is held constant, will it melt or sublime? (e) If methane at 1 atm and 0 °C is compressed until a phase change occurs, in which state is the methane when the compression is complete?
The vapor pressure of acetone (C;H,O) at 39.5°C is 400 torr. (a) If the boiling point of acetone is 56.5°C, calculate its enthalpy of vaporization (AHvap; in kJ/mol). (b) Using calculated (AHvap and vapor pressure at 39.5, calculate the vapor pressure of acetone at 25°C. (R = 8.314 J/(mol.K))
A 5.4-L closed vessel is filled with 0.46 g of liquid ethanol. This ethanol containing closed vessel is placed in the freezer and reaches the vapor pressure of 6.65 torr at -11 C. (i) Is there any liquid ethanol remained in the closed vessel when the container is removed and warmed to the temperature of 25 C? Justify your answer. (ii) How many grams of liquid ethanol remained in the vessel at 2.0 C? The enthalpy changes of vaporization, AH,vap of ethanol is 40.5 kJ/mol. The molar mass of ethanol is 46.07 g/mol.
21) much heat is required to raise the temperature of the sample to 30.0°C? A benzene sample with a mass of 47.7 g is removed from a freezer at an initial temperature of -10.2°C. How (A) (B) (C) (D) (E) 6.06 kJ 476 k) 9.18 kl 3.12 kJ 8.39 k)
Naphthalene undergoes sublimation: C10H8(s) ⇄ C10H8(g). In a closed container at 600.0 K, the equilibrium vapor pressure is 0.35 torr. What is the value of Kc?
For the process X(1)X(g), where X is a metal, AH°=433.4 kJ/mol and AS°-101.1 J/(K mol). What is the normal boiling point of X in °C?
For the process X(l) → X(g), where X is a metal, AH°=334.4 kJ/mol and Asº-110.1 J/(K mol). What is the normal boiling point of X in °C?
A liquid at 20.0 °C exhibits a vapor pressure of 0.555 atm. The liquid is heated to 60.0 °C. What is the new vapor pressure (in atm to three decimal places) if ΔHvap = 25.595 kJ mol–1?

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