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# Lec6 - Problem from Last Time What is the minimum...

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1 1 What is the minimum temperature to which Ag 2 O needs to be heated to decompose the ore to produce silver metal and oxygen gas? 2Ag 2 O(s) 4Ag(s) + O 2 (s) H o = 62.10 kJ, S o = 132.7 J/K G o = 22.5 kJ G = H – T S A) 563 o C B) 468 o C C) 563 K D) 468 K Problem from Last Time 2 What is the minimum temperature to which Ag 2 O needs to be heated to decompose the ore to produce silver metal and oxygen gas? 2Ag 2 O(s) 4Ag(s) + O 2 (s) H o = 62.10 kJ, S o = 132.7 J/K G o = 22.5 kJ G = H – T S G goes from + to – at T where G = 0 Then T = H/ S = 468 K A) 563 o C B) 468 o C C) 563 K D) 468 K

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2 3 G = H – T S Is the following statement correct? 1) A reaction with H < 0 and S > 0 is spontaneous at all T. Yes, –T S is always negative so G is always negative! A) Yes B) No 4 G = H – T S Is the following statement correct? 2) A reaction with H > 0 and S < 0 is not spontaneous at all T. Yes, -T S is always positive so G is always positive, no matter what the temperature. A) Yes B) No
3 5 G = H – T S Is the following statement correct? 3) A reaction with H > 0 and S > 0 is spontaneous at a high T but not at low T. Yes, at high T the negative –T S term dominates, said to be entropy driven A) Yes B) No 6 G = H – T S Is the following statement correct? 4) A reaction with H < 0 and S < 0 is spontaneous at a low T but not at high T.

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Lec6 - Problem from Last Time What is the minimum...

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