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.
The phase diagram of a hypothetical substance is (a) Estimate the normal boiling point and freezing point ofthe substance. (b) What is the physical state of the substanceunder the following conditions? (i) T = 150 K, P = 0.2 atm;(ii) T = 100 K, P = 0.8 atm; (iii) T = 300 K, P = 1.0 atm.(c) What is the triple point of the substance?
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)?
The phase diagram of a hypothetical substance is (a) Estimate the normal boiling point and freezing point ofthe substance. (b) What is the physical state of the substanceunder the following conditions? (i) T = 150 K, P = 0.2 atm;(ii) T = 100 K, P = 0.8 atm; (iii) T = 300 K, P = 1.0 atm.(c) What is the triple point of the substance? [Section 11.6]
(3) Vapor pressure of liquid ethanol is 7291 Pa at 20°C. (a) one student reports that the vapor pressure is 31741 Pa at 52°C. Another student reports it to be 31741 Pa at 502°C. Which of the results is correct? Why? (b) calculate the normal boiling temperature of ethanol (assume Patm=101,325Pa).
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.
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
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))
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?
The normal boiling point of benzene is 80.1 °C. What is the vapor pressure of benzene at 80.1 °C? (A) 1 atm (B) cannot be determined (C) 760 atm (D) 1 torr

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