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​If a 0.1 M solution of glucose 1-phosphate is incubated with a catalytic amount of phosphoglucomtase, the glucose 1-phosphate is transformed to gluco
Question

If a 0.1 M solution of glucose 1-phosphate is incubated with a catalytic amount of phosphoglucomtase, the glucose 1-phosphate is transformed to glucose 6-phosphate. At equilibrium, the concentrations of the reaction components are:

What would be the calculated values for KeqK^{'}_{eq} and G0∆G^0 for this reaction at 25°C?

A.

​​(0.0045 to 0.096) and (-0.7 to-0.8) kJ/mol

B.

(21 to 22) and (-7.5 to 7.7) kJ/mol

C.

(0.1 to 0.2) and (-17.6 to-17.7) kJ/mol

D.

(21 to 22) and (-27.7 to-27.8) kJ/mol

Correct option is B

To calculate the equilibrium constant (Keq) and standard free energy change (ΔG°') for the given reaction, we can use the following formulas:

1. Equilibrium constant (Keq):

We can calculate the equilibrium constant using the formula:

Keq=[Glucose6phosphate][Glucose1phosphate]K_{eq} = \frac{[Glucose 6 - phosphate]}{[Glucose 1 - phosphate]}

Given:

  • [Glucose6−phosphate]=9.6×10−2M[Glucose 6-phosphate] = 9.6 \times 10^{-2} \, M[Glucose6phosphate]=9.6×10-2 M

  • [Glucose1−phosphate]=4.5×10−3M[Glucose 1-phosphate] = 4.5 \times 10^{-3} \, M[Glucose1phosphate]=4.5×10-3 M

Keq=9.6×1024.5×103=21.33K_{eq} = \frac{9.6 \times 10^{-2}}{4.5 \times 10^{-3}} = 21.33

2. Standard Free Energy Change (ΔG°'):

The standard free energy change (ΔG°') is related to the equilibrium constant (Keq​) by the following equation:

ΔG=RTlnKeq\Delta G^\circ = -RT \ln K_{eq}  

Where:

  • R is the gas constant = 8.314 J/(mol·K)

  • T is the temperature in Kelvin. Since the problem gives the temperature as 25°C, we need to convert it to Kelvin:
    T=25+273.15=298.15KT = 25 + 273.15 = 298.15 \, KT=25+273.15=298.15K

    ΔG\Delta G^\circ =−8.314×298.15×ln⁡(21.33)-8.314 \times 298.15 \times \ln(21.33)8.314×298.15×ln(21.33)   

where, 

ln⁡(21.33)≈3.063\ln(21.33) \approx 3.063ln(21.33)3.063

Therefore, the result is:

ΔG\Delta G^\circ= -7595.2 J/Molar ,ΔG\Delta G^\circ = -7.6 KJ/M

Final Answer:

The calculated values forKeqK_{eq}Keq and ΔG\Delta G^\circ​G∘\Delta G^\circΔG are:

Keq  =21.33 

ΔG\Delta G^\circ = -7.6 KJ/M​

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