CHEM 112 Lecture Notes - Lecture 31: Ionic Radius, Silver Bromide, Intermolecular Force
12 Apr 2016
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Question: which of the following molecules will have the highest entropy value, a. Entropy trends: entropy values increase for larger molecules vs. smaller molecules. Entropy of naf > entropy of mgo: charge +1/-1 and +2/-2, respectively. Entropy of naf < entropy of csi: charge +1/-1 and +2/-2, radii 11/9 to 55/53. Question: which of the following will have the smallest entropy value, a. fe2o3, b. agbr, c. na2o, d. niso4, e. alf3, the answer is a. You only need to look at the charges since they are different. Remember that the highest charge state, q = charge number, is the one with the strongest imf and thus the smallest entropy value. Molar entropies and calculating reaction entropy: under standard conditions, the change in entropy of a reaction can be calculated from the individual entropies, s, example. S!reactants: 2 no (g) + o2 (g) 2 no2 (g) I2 (g) + cl2 (g) 2 icl (g)
