Fa08-MT1-Huang-Soln - POOQAELM iii: Hum MTQ FOE Some gar (Y...

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Unformatted text preview: POOQAELM iii: Hum MTQ FOE Some gar (Y i .___L____. EC: L m 3 kumc‘cN/J) Jam \ (3‘ - Mow/negechx—Q 9M N/V j Mamba 3» '. CL mm ©ccoggl‘es AMLm ST? W a (my: (Lozme‘ mm. ‘fibwew‘oc/ Uh'bg‘VD be Kmoo‘imegwfi 00* L‘ / \f“: 0.033% mi) N Q,03~A1033m¢\ .\ "##2— -—---**’_'"_" :1 3.98W095m0 3 V ooan m3 m MWOCA ’A‘. 9W7NKT ;: Ala-:3— \I\C" «Q8: o(\*°‘A—Y\ PT”- st: LOWVVOLZSYN; Hana 3 4} (35 pts.) One mole of water is cooled from T;=25 0C to '15:!) "C and frozen in a refrigerator. You can treat the heat being taken out of the water as the low~temperature heat input for the refrigerator. The refrigerator operates at maximum theoretical efficiency (no entropy created) and exhausts heal into a second mole of water at (again) T;=35 “C. heating it to T_.-:l00 “C and converting a fraction (n’ mole) into vapor. Note: For parts a) through (I). express your answer for each part in terms of any or all of the quantities given in the problem. 2?}. T3. T} and n', and relevant physical constants. You can use at as the mass of one mole of water. Also remember that there are two thermodynamic processes for each of these parts: the cooling and the freezing. or. the warming and the vaporization. a} Find the total amount of heat. IQil. that flows out of the first mole of water. ‘Asflme 0er sit! he} Q'B’c +01: = “C (Ki-T") «wig-H = [91’ leuva'c ’0' “quaint, L5,,“ Answer: imcm‘fi) - mid .0) Find [he total amount ofcnlrupy. IAS‘H. that flows nul 01‘ [he first mole of water. A5! = 4Q “I: a“ '90'C “no : f-%mch at {- mm cerium];v convert in “Ink! 8 MC T3 JB‘ 7;! ° Answer: 75'. ('J Find the IOIEII amounl of heat, lQ-gl. than “0W5 into the second mole of water. 0:. Isa-Nut mc (73 “7;.)_ a: ywtze 3" n J” Li! Answer: [mag-1;) “rm 1%] (1‘) Find the lulu] amount of cnlropy. IASgl. that flows into the second mole of water. no“ ASIS‘L-nao‘ " as. 7; J. = mi] 1.47“ 3 Inc 251 5 ... 53; ‘ir-‘J'v-‘r 7; _ : ’l'fllvz-V‘_ 73- Answer: c!) What is ASH AS-g‘? Note than there are no absolute value signs around the entropy channg here. (Him: Can this proccsx be reversed?) inc/n - + f. ’7ng . z _ = mc/n ,zi _—;n(%_g_’£g 7?, 7:: Answer: f) Find n ’. ““/%)-m .3, 3 Formulaic Answer: TI: geek 1;: 25‘3K Li: 3.33~:o‘,:§ * L,= amend—i c = '1. l‘Prlo’ g5 Numerical Answer: B How much work. IW]. must he dnnc by the refrigerator? I 1] zlwl+ 162d (w! 2 In: c (I; 4,.) +n’er) - {mew-7;)- mgr ': OCR-fit!) +3)” *WM—RJ .-.-. Fm'mulaic Answer: [rims 4;)”:th ‘7»(Z-D-m111g Numerical Answer: [Jr-NW. ...
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This note was uploaded on 02/04/2010 for the course PHYSICS 7B taught by Professor Packard during the Spring '08 term at University of California, Berkeley.

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Fa08-MT1-Huang-Soln - POOQAELM iii: Hum MTQ FOE Some gar (Y...

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