How much energy is utilised in the synthesis of one gram mole of glucose

Options

A. 673 kcal
B. 686 kcal
C. 666 kcal
D. 696 kcal.

Answer

To determine how much energy is utilized in the synthesis of one gram mole of glucose, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Process of Glucose Metabolism**:
- Glucose (C6H12O6) is metabolized in the presence of oxygen to produce carbon dioxide (CO2) and water (H2O), releasing energy in the process.

2. **Identify the Energy Released During Metabolism**:
- The complete oxidation of one mole of glucose results in the release of approximately 686 kilocalories (kcal) of energy.

3. **Consider the Reverse Reaction**:
- The synthesis of glucose from carbon dioxide and water is the reverse of its oxidation. In this case, energy is required rather than released.

4. **Energy Utilized in Synthesis**:
- Since the synthesis of glucose is the reverse of its metabolism, the amount of energy required for this process is equal to the energy released during metabolism. Therefore, the energy utilized in the synthesis of one mole of glucose is also 686 kcal.

5. **Conclusion**:
- The energy utilized in the synthesis of one gram mole of glucose is 686 kcal.

### Final Answer:
The energy utilized in the synthesis of one gram mole of glucose is **686 kcal**.