https:// session masteringchemistry.com 49649263 CHM116 SU2015 Ch 9 HW Problem 1

Question

https:// session masteringchemistry.com 49649263 CHM116 SU2015 Ch 9 HW Problem 19.71 Problem 19.71 Part B Consider the following reaction between oxides of nitrogen: calculate AG at 800 K. assuming that AH nd AS do not change with temperature. NO2 (g) +N20(g 3NO(g) Express your answer using two significant figures. AG 159.1 kJ Submit My Answers Give U incorrect Try Again Part C Under standard conditions is the reaction spontaneous at B00 K My Answers Give Up Correct Part D calculate AG at 1000 K. AG kJ Submit My Answers Give U incorrect Try Again Part E Help Close Resources a previous l 14 of 17 I next

Explanation / Answer

We need the following data

Substance Delta Ho       Delta Go         Delta So

NO2(g)             33.84 KJ          51.84            240.45 J

N20(g) 81.6 KJ         103.59            220 J

NO(g)                90.37 KJ         86.71             210.62 J

Delta Ho = 3X Delta Ho (NO) - [ Delta Ho NO2 + Delta Ho N2O ] = 3X90.37 - ( 33.84+81.6) = 271.11 - 115.44

Delta Ho = 155.67 KJ

Delta So = 3X Delta So (NO) - [ Delta So NO2 + Delta So N2O ] = 3X 210.62 - ( 220+240.45) = 171.41 J = 0.171 KJ

Delta Go = Delta Ho - TDelta So

Delta Go = 155.67 - 800 X 0.171 = 18.87

C) the positive value of delta G shows that the reaction will not be spontaneous at the given temeprature

D) at T = 1000 K

Delta G = 155.67 - 1000 X 0.171 = -15.33

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