08 Applications

08 Applications - G = H T S At high T, the S term dominates...

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1 G = H – T S Which of the following statements are correct? 1) H > 0, S > 0 spontaneous and product favored at a high T. 2) H > 0, S < 0 not spontaneous, reactant favored at all T. 3) H < 0, S > 0 spontaneous and product favored at all T. 4) H < 0, S < 0 spontaneous and product favored at a low T . A) Only 3 & 4 B) Only 2 & 4 C) Only 1 & 3 D) Only 1 & 2 E) All 4 are correct. At high T, the S term dominates the H term! 2 G = H – T S Which of the following statements are correct? 1) H > 0, S > 0 spontaneous and product favored at a high T. At high T the –T S term dominates, Entropy driven 2) H > 0, S < 0 not spontaneous and reactant favored at all T. G is always positive, no matter what T 3) H < 0, S > 0 spontaneous and product favored at all T. –T S is always negative & G is always negative 4) H < 0, S < 0 spontaneous and product favored at a low T . –T S is always positive At low T, the H term dominates, Enthalpy driven ALL ARE CORRECT!
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3 What makes a cold pack work? Cold packs use an endothermic chemical reaction to spontaneously absorb energy, e.g. NH 4 NO 3 (s) + H 2 O(l) NH 4 + (aq) + NO 3 - (aq) H o = +21 kJ/mol H, S, and G refer to the reacting system. This reaction is spontaneous because A) H > 0 B) H < 0 C) G > 0 D) S > 0 E) S < 0 G = H – T S 4 G and Spontaneity We can change G of chemical reactions and affect spontaneity by changing the Temperature Concentrations in solution Pressure of gases Some example problems follow.
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This note was uploaded on 02/13/2011 for the course CHE 132 taught by Professor Hanson during the Spring '08 term at SUNY Stony Brook.

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08 Applications - G = H T S At high T, the S term dominates...

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