MastenngChemistry: HW 7 on Chapter 17 . Google Chrome G https//session CHEM 1515

Question

MastenngChemistry: HW 7 on Chapter 17 . Google Chrome G https//session CHEM 1515-Spring 2016 stry.com/myct/itemView assignmentProblemiD 59095987 Signed in as Raegan Chambers bes Question 6 previous 6 of 13 I ne Question 6 Part A Consider the oxidation of NO to NO2 NO(g) + O2 (g) NO2(g) Calculate AGira at 25°C Express your answer with the appropriate units ts. Reactant or AH NO 02 NO: (J/mol) mol- K) 210 8 205 2 240 1 91.3 alue Units 33 2 Submit My Answers Give Up Incorrect; One attempt remaining: Try Again Part B Determine whether the reaction is spontaneous at standard O spontaneous Submit My Answers Give Up 18 25

Explanation / Answer

NO(g) + (1/2)O2 ------> NO2(g)

delta H0rkn = delta H0f NO2 - delta H0f NO - (1/2)*delta H0f O2 = 33.2-91.3 = -58.1 kJ

delta S0rkn = delta S0f NO2 - delta S0f NO - (1/2)*delta S0f O2 = 240.1 - 210.8 - (1/2)*205.2 = -73.3 J/K

Now, delta G0rkn = delta H0rkn - T*delta S0rkn = -58100 - 298*(-73.3) = -36256.6 J = -36.256 kJ

Since delta G0 < 0 , the reaction is spontaneous.

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