ThermochemistryHard

Question

In biological cells that have a plentiful supply of O2, glucose is oxidized completely to CO2 and H2O by a process called aerobic oxidation. Muscle cells may be deprived of O2 during vigorous exercise and in that case, one molecule of glucose is converted to two molecules of lactic acid, CH3CH(OH)COOH, by a process called anaerobic glycolysis.

C6H12O6(s) + 6O2(g) → 6CO2(g) + 6H2O(l); ΔH° = –2880 kJ/mol

C6H12O6(s) → 2CH3CH(OH)COOH(s); ΔH° = +2530 kJ/mol

Which of the following statements is true regarding aerobic oxidation and anaerobic glycolysis with respect to energy change as heat?

Options

A.Aerobic oxidation has biological advantage over anaerobic glycolysis by 5410 kJ/mol
B.Aerobic oxidation has biological advantage over anaerobic glycolysis by 350 kJ/mol
C.Anaerobic glycolysis has biological advantage over aerobic oxidation by 5410 kJ/mol
D.Anaerobic glycolysis has biological advantage over aerobic oxidation by 350 kJ/mol

Solution

Aerobic oxidation results release of energy and hence, it is biologically beneficial by

(2880 + 2530 = 5410 kJ/mol)

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