In anaerobic cells glucose C6H12O6 is converted to lactic acid: C6H12O6 → 2CH3CH(OH)COOH. The standard enthalpies...

In anaerobic cells glucose C6H12O6 is converted to lactic acid: C6H12O6 → 2CH3CH(OH)COOH. The standard enthalpies of formation of glucose and lactic acid are –1274.45 and –694.04 kJ/mol, respectively. The molar heat capacities (at constant pressure) for glucose and lactic acid are 218.86 and 127.6 J/mol K, respectively.

(4.a) Calculate the molar enthalpy associated with associated with the formation lactic acid from glucose at 298 K.

(4.b) What would the quantity in part (4.a) be if the reaction proceeded at a physiological temperature of 310 K?

(4.c) Based on your answers in parts (4.a) and (4.b) how sensitive is the enthalpy of this reaction to moderate temperature changes?

Expert Solution

queen_honey_blossom answered 1 year ago

Use bond enthalpies to estimate a) the enthalpy of the anaerobic breakdown of glucose to lactic...

Use bond enthalpies to estimate a) the enthalpy of the anaerobic breakdown of glucose to lactic acid in cells that are starved of oxygen, C6H12O6(aq) → 2 CH3CH(OH)COOH(aq), b) the enthalpy of combustion of glucose. Ignore the contributions of enthalpies of fusion and vaporization.

Under anaerobic conditions, glucose is broken down in muscle tissue to form lactic acid according to...

Under anaerobic conditions, glucose is broken down in muscle tissue to form lactic acid according to the reaction: C6H12O6 → 2 CH3CHOHCOOH Use data from the 'official' tables available in the BCH341 website in addition to the heat capacities for glucose and lactic acid given below: Assume all heat capacities are constant from T = 298 K to T = 310 K. For glucose, Cop,m=218.2JK.mol For lactic acid, Cop,m=127.6JK.mol Note: All thermodynamic quantities in this problem are per mol of glucose. Be...

Under anaerobic conditions, glucose is broken down in muscle tissues to form lactic acid according to...

Under anaerobic conditions, glucose is broken down in muscle tissues to form lactic acid according to the reaction, C6H12O6(s) → 2CH3CHOCOOH(s). Thermodynamic data for glucose and lactic acid at 298 K are given below. ΔHfº (kJ/mol) Cp.m (J/mol∙K) Smº (J/mol∙K) Glucose −1273.1 219.3 209.2 Lactic Acid −673.6 127.6 192.1 (a) Calculate ΔS for the system, surrounding and universe at T = 325 K. Assume the heat capacities are constant between 298 K and 325 K. (b) Is this reaction spontaneous...

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Consider the titration of 171 mL of 0.961 M lactic acid, CH3CH9OH)COOH, Ka = 1.38E-4, with...

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