Centro Ohemistry Part 2 focus of Topic 10 Entropy is gi ven the symbol S. The mi

Question

Centro Ohemistry Part 2 focus of Topic 10 Entropy is gi ven the symbol S. The mixed up things are, the high er the ent tropy. The more ways for a thing to be considered the same (how many ways can 3 penanieshave l head and two tai the higher the entropy. Entropy and disorder are closely related. As disorder increases, entropy increases For exam consider your sock drawer. If the socks are pained, the entropy is relatively low, but if the socks are a mined up, the entropy is mul ch higher there are many ways to arrange the particles in the gstem, then there is greater disorder 9stems with greater disorder have greater entropy 1. Consider the following reactions. Use your intuition to complete the table below 2. Lastly, use the table of thermodynamic functions to compute the AHO and AS" for the reactions in Then using AH and AS and your knowledge of the second law, compute which neactions are spontaneous under standard conditions

Explanation / Answer

1) 2H2 (g) + O2 (g) ------> 2H2O (l)
   disorder decreases so entropy also decreases, S = negative
  CO2 (S) --------> CO2(g)
  disorder increases so entropy also increases,  S = positive
K+(aq) + Br-(aq) ---------> KBr (s)
disorder decreases so entropy also decreases,  S = negative
2) 2H2 (g) + O2 (g) ------> 2H2O (l)
   H = negative ; S = negative ; S universe = positive ; spontaneous
  CO2 (S) --------> CO2(g)
H = positive ; S = positive ; S universe = negative ; non-spontaneous
K+(aq) + Br-(aq) ---------> KBr (s)
H = positive ; S = negative ; S universe = negative ; non-spontaneous

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