3.5 - 18 QMany instant cold-packsare...

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Unformatted text preview: 18. QMany instant cold-packsare available'tbese'daysiand-many consist of a sealed packet of water with a solid ammonium salt: 'When the Water is released by breaking the packet, the dissolution of the ammonium salt in the water'drastieally drops the temperature of the pack. Based on the informationig ‘ ' I e‘signsof AQ, AH, AS, and what is the drivin, force f is rocessm ' f— + _, a, -, +, +, entro- - . , . —,+,+, enthalpy: - -. ,2 e. +, +, +_, entropy ;—'+‘-;’4; entrapy *AG = MN - TWA-‘3) t wasw , Pill-l - rm 5) 19. Q What is the value of AG°'a{2‘5°e for a reaction with K5105? (8.314 JK)(298K)111(10.5) a # mole- 7 (7"?ng e)[w0mbs] ' 1:1:‘2 7 :32: ‘ male 6 ; , e— ,_ I ,. ‘J' mole.:.-K : J Li": CB)—[8.3l4——J—w](298K)1n(1-0.5i)k _ 0 3-K . L d. {7711016 e7) W][10.5 J, ] . mole e coulomb 20. Unlike most equilibria, solubility may not go to £1"; lib I W M unless there is sufficient solute to fortna, ‘fatl‘wd‘fi Said—Ego, otherwise it “all Jr‘ssol ues .. wasusaturation, (ii-latest)lut~i5nglprécipitates L L A' ' ' . r' 0 c equilibrium, Satorated solutionsplieeipitates . saturation;-dilute solution—:xpreéi itates» e. equilibrium, saturated solution, all dissolves Complete the table below with the appropriate entries (eg. +‘, -, >1, etc.) [email protected] ...
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