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KTS_Final_Review_Spr208_Q_A

KTS_Final_Review_Spr208_Q_A - Sylvester Chem 208_Review...

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Sylvester May 6, 2007 Chem 208_Review Session 1 of 8 Question 1: Enzymes are biological catalysts that lower the activation energy in the forward and reverse direction. The rate law of enzymatic reactions can typically be approximated by the Michaelis- Menten equation d P [ ] dt = k 2 E [ ] T S [ ] K M + S [ ] ;where E [ ] T = E [ ] + ES [ ] [E] T is the total enzyme concentration, [ES] is the concentration of enzyme bound to the substrate, and [E] is the concentration of free enzyme. Given the mechanism below, derive the M&M rate expression and K M in terms of the mechanistic rate constants E + S ES ES E + P k 1 k -1 k 2 Question 2: If a 7.250 kg brick of gold is placed in a conventional oven at 235 o C and is subsequently dropped into a dewer containing 0.500 L of liquid nitrogen (density of 0.808 g/mL, heat capacity of 2.042 J/g K) at 65.0 K, what is the final temperature of the nitrogen? Hint: consider the state of matter of the nitrogen. (Assume that no heat is lost to the surroundings). The boiling point of liquid nitrogen is 77.36 K. The enthalpy of vaporization of nitrogen is 5.57 kJ/mol. The specific heat capacity of gaseous nitrogen is 29.124 J/mol K). The specific heat capacity of gold is 0.129 J/g K. Question 3: Hydrogen oxalate is a monoprotic, weak organic acid. You are given a 100 mL solution of unknown concentration of hydrogen oxalate . You measure the pH of the solution to be 2.22 and the addition of 4.96 g of ferric chloride hexahydrate [FeCl 3 6H 2 O] to the unknown complexes all of the oxalate. Determine the pKa of sodium hydrogen oxalate monohydrate (NaHC 2 O 4 H 2 O) and the initial concentration of the unknown solution. Fe 3 + ( aq ) + 3 ox 2 " # $ # Fe ( ox ) 3 [ ] 3 " ( aq ) K = 2 % 10 20 Question 4: Given the following reactions, calculate the standard cell potential for the formation of gaseous water from oxygen and a proton in the presence of iron(II) . Secondly calculate the free energy
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