CHEM 1050 Lecture Notes - Lecture 19: Glucono Delta-Lactone, Bayerischer Rundfunk, Bromine

• School: University of Guelph
• Department: Chemistry
• Course: CHEM 1050
• Professor: Mario Monteiro

Document Summary

Day 18: free energy and emf [oct 19] Homework: find out if the reactions are spontaneous. A) cu(s) + 2h+ cu+2 + h2(g) B) cl2 + 2i- 2cl + i2(s) solution for b) 2e- + cl2 2cl- erdn = +1. 36 v. 2i- i2 + 2e- eox = - 0. 54 v therefore: e cell = + 0. 82 v spontaneous free energy and emf there is a relationship between cell emf and g. N = number of moles of electrons being transferred. = faraday"s constant [electrical charge on one mole of electrons] 1 = 96,50 c/mol e- j/v mol e- Use standard potentials to calculate g (aq) + f2 (g) br2 (l) + 2f- so: f2 + 2e- 2f- erdn = +2. 87 v. And: 2br- br2 + 2e- eox = -1. 06 v. N = 2 (two electrons are being transferred) (aq) Negative = spontaneous positive emf also says it is spontaneous remember g = -n e , and the 96,500.