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Safari File Edit View History Bookmarks Window Help smartwork.Wwnorton.com Smart VVWTK Mount St Marys Con, Cnermistry roz Spring ZOTS Braamey, Spring Z015, ProT. Braamey SMARTWORK 3.0 l wwN7750 HOMEWORK 7 Ebook Calcu Pri Periodic Table Question 7 of 24 (1 point) The dissolution of ammonium nitrate is given by the reaction H4 (aq) Noir (ag) Assuming that the values of AHe and AS do not change appreciably with temperature, calculate the AG value for the reaction from the polyatomic ion data in standard dynamic property tables, and predict the lowest temperature at which the reaction is spontaneous. AG" Number Number kJ v Check Answer View Solution Hin 1 2 3 4 5 6 7 8 9 Record my Grade Progress Activity Grade: 24 Points Possible Fri 2:30 PM E

Explanation / Answer

?G = ?H - T?S

from standard values

?Hrxn = ?H form products - ?H form of reactants

?H rxn = ?H (NH4+ + NO3-) - ?H (NH4NO3) = [ (?132.51 + (  ?207.36)  ]   - (?365.56) = -339.87 + 365.56 = -25.69KJ

?Srxn = ?Sproducts - ?Sof reactants

?S rxn = ?S(NH4+ + NO3-) - ?S (NH4NO3) = 113.39 + 146.44 - 151.08 = 108.75 J

?G = ?H - T?S = -25.69 - 298 K x 0.108 = -57.84

?G =0 when

?H = -T?S

T = -?H / ?S = 25.69 / 0.108 = 237.87

so above this temperature it will be spontaneou

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