Calculating AGº for Reactions: Atmospheric Chemistry The atmospheric chemistry of NOx compounds is a series of reactions

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Calculating Ago For Reactions Atmospheric Chemistry The Atmospheric Chemistry Of Nox Compounds Is A Series Of Reactions 1 (79.75 KiB) Viewed 32 times

Calculating AGº for Reactions: Atmospheric Chemistry The atmospheric chemistry of NOx compounds is a series of reactions that can lead to the production of one form of acid rain (HNO3). The free energy change for these reactions at standard state conditions (AGO) can be calculated from AH° and AS° values. Even though this is calculated at a temperature other than 25°C, it is still considered to be a temperature adjusted AG because here the standard state conditions that persist are the pressure (1 atm.) and the presence of 1 molar amounts of products and reactants. One of the reactions along the pathway to acid rain appears below: Compound H₂O (1) H₂O (9) N₂ (9) NO (g) NO₂ (9) NO3 (9) N₂O4 (9) N₂O5 (9) HNO3(aq) HNO3 (9) N₂O (9) O₂ (9) AH₂ (in kJ/mol) - 285.8 - 241.8 0.00 91.3 33.2 71.13 11.1 13.3 - 207.0 - 133.9 81.6 0.00 N₂O5 (g) + H₂O (1) = 2 HNO3 (9) sº (in J/molk) 70.0 188.8 191.6 210.8 240.1 252.61 304.4 355.7 146.0 266.9 220.0 205.2 a) What is the temperature adjusted AGº (in kJ/molrxn) for this reaction at 44° C? kJ/molrxn b) What is the temperature adjusted AG° (in kJ/molrxn) for this reaction if the temperature is increased to 280° C? kJ/molrxn c) Is this reaction spontaneous or non-spontaneous at 280° C under temperature adjusted standard state conditions? O Spontaneous O Non-spontaneous