A solution of 0.2 M dehydroascorbate and 0.2 M ascorbate(E0.06 V) was mixed with

Question

A solution of 0.2 M dehydroascorbate and 0.2 M ascorbate(E0.06 V) was mixed with an equal volume of a solution containing 0.01 M acetaldehyde and 0.01 M ethanol (E -0.163 V) at 25°C and pH 7. Calculate the Eo' for the possible reaction. a. 0.103 b.+0.223 c. -0.223 d. +0.111e.-0.111 . Calculate standard free energy change for the reaction in Question 1. Faraday constant F 23,063 cal/Volt. a. +10,286 b. 10,286 c. +5,143 d. - 5,143 e. 20,672 cal/mole . Lactic dehydrogenase was added to the reaction mixture containing lactate/pyruvate and NAD /NADH at a ratio equal 1000. E (lactate/pyruvate)- 0.190 Volt; E"(NADH/NAD+)--0.320 Volt. Calculate E' (nonstandard) between the two systems. a. +0.250 V b. - 0.050 V c. -0.510 V d. +0.050 V e.-0.072 V Calculate free energy change for the reaction occurring between the two systems in Question3 a. - I ,303 b.-2,306.3 c. + 1 ,303 d. + 2,306.3 e.-3,321.7 cal/mole

Explanation / Answer

1) Eo = Eocathode - Eoanode

= 0.06-(-0.163)

= 0.06+0.163

= + 0.223

2) delta G = -nFEo

= -2×23063×0.223

= - 10286.098

= - 10.286KJ

3)  

  

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