# 8.1.7 Practice General Equilibrium.pdf - 8.1.7 Practice...

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8.1.7 Practice: General Equilibrium Xing Chan 1. The formation of water from its elements at 1200 K can be written as a series of coupled reactions: (1 point) Suppose the system has the following concentrations: [H 2 ] = 0.0041 [O 2 ] = 0.0062 [H 2 O] = 2.3 Predict the direction in which the system will shift to reach equilibrium. Justify your answer. With the given concentrations, the equilibrium direction will shift to the left (reactants) 2. The figure below shows two possible methods for the production of acetyl CoA from acetate as part of the biosynthesis of fatty acids in the body. The first method is a direct reaction, and the second method involves coupled reactions. Direct Reaction M M M
Coupled Reactions Step 1 Step 2 a. The standard Gibbs free energy for the direct reaction, Δ G °', is 32 kJ/mol. (Note that the prime symbol is used for biological systems.) Calculate the equilibrium constant for the reaction at a temperature of 298 K. Is the reaction favorable or unfavorable? Explain. (1 point)
b. Calculate the equilibrium constant for each step of the coupled reactions. Δ G 1 °' is about 11 kJ/mol for the first reaction, and Δ G 2 °' is about –10 kJ/mol for the second reaction. Is each step favorable or unfavorable? Explain. (1 point)
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