Question

When glucose is completely oxidized to CO2 and water, C6H12O6 + 6O2 \(\rightarrow\) 6 CO2 + 6H2O, what will be the RQ?

• A. 0.7
• B. 0.8
• C. 0.9
• D. 1.0

Hint:

Respiratory Quotient (RQ) Values:
Carbohydrates (Glucose/Starch) = 1.00.
Proteins = 0.80--0.82.
Fats Lipids (Triglycerides) = 0.70.
Mixed Diet = 0.85.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Respiratory Quotient (RQ) stoichiometry: the ratio of moles of carbon dioxide produced to moles of oxygen consumed during complete substrate catabolism.
Key Formula or Approach:
\[ \text{Respiratory Quotient (RQ)} = \frac{\text{Moles of } \text{CO}_2 \text{ Produced}}{\text{Moles of } \text{O}_2 \text{ Consumed}} \]

Step 2: Detailed Explanation:
Calculating the Respiratory Quotient (RQ) for glucose:
1. Balanced stoichiometric oxidation reaction:
\[ \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \longrightarrow 6\text{CO}_2 + 6\text{H}_2\text{O} \]
2. Moles of $\text{CO}_2$ produced = $6$.
3. Moles of $\text{O}_2$ consumed = $6$.
4. \( \text{RQ} = \frac{6}{6} = 1.00 \).
(Compare with Tripalmitin Fat $\text{RQ} \approx 0.70$, Protein $\text{RQ} \approx 0.80 - 0.82$).

Step 3: Final Answer:
Hence, the RQ for complete glucose oxidation is 1.0, corresponding to option (D).