# 090320_homework8_answer_v2 - P7.1 In this problem you will...

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P7.1) In this problem, you will calculate the differences in the chemical potentials of ice and supercooled water, and of steam and superheated water all at 1 bar pressure shown schematically in Figure 7.1. For this problem, S H 2 O , s ° = 48.0 J mol 1 K 1 , S H 2 O , l ° = 70.0 J mol 1 K 1 and S H 2 O , g ° = 188.8 J mol 1 K 1 . a. By what amount does the chemical potential of water exceed that of ice at –5.00°C? b. By what amount does the chemical potential of water exceed that of steam at 105.00°C? a) By what amount does the chemical potential of water exceed that of ice at – 5.00ºC? 1 1 1 1 1 , , 110 ) 00 . 5 ( ) 0 . 48 0 . 70 ( ) )( ( ) 0 ( 2 2 = × = Δ = Δ = Δ = Δ Δ Δ = Δ = Δ Jmol K mol JK mol JK T S S G P T S G o s O H o l O H m m m μ b) By what amount does the chemical potential of water exceed that of steam at 105.00ºC? 1 1 1 1 1 , , 594 ) 00 . 5 ( ) 8 . 188 0 . 70 ( ) )( ( 2 2 = × = Δ = Δ = Δ Jmol K mol JK mol JK T S S G o g O H o l O H m P7.3) Within what range can you restrict the values of P and T if the following information is known about CO 2 ? Use Figure 7.8 to answer this problem. a. As the temperature is increased, the solid is first converted to the liquid and subsequently to the gaseous state. b. As the pressure on a cylinder containing pure CO 2 is increased from 65 to 80 atm, no interface delineating liquid and gaseous phases is observed. c. Solid, liquid, and gas phases coexist at equilibrium.

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d. An increase in pressure from 10 to 50 atm converts the liquid to the solid. e. An increase in temperature from –80° to 20°C converts a solid to a gas with no intermediate liquid phase. a) The temperature and pressure are greater than the values for the triple point, –56.6ºC and 5.11 atm. b) The temperature is greater than the critical temperature, 31.0ºC. c) The system is at the triple point, –56.6ºC and 5.11 atm. d) The temperature is slightly greater than the triple point value of –56.6ºC. e) The pressure is below the triple point pressure value of 5.11 atm. P7.5) The vapor pressure of liquid SO 2 is 2232 Pa at 201 K, and Δ H vaporization = 24.94 kJ mol –1 . Calculate the normal and standard boiling points. Does your result for the normal boiling point agree with that in Table 7.2? If not, suggest a possible cause.
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## This note was uploaded on 04/14/2010 for the course CHEM 340 taught by Professor Yoshitakaishii during the Spring '07 term at University of Illinois, Urbana Champaign.

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090320_homework8_answer_v2 - P7.1 In this problem you will...

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