Calculate the COD (Chemical Oxygen Demand) concept: write the reaction for the complete oxidation of glucose and — JEE Chemistry
Calculate the COD (Chemical Oxygen Demand) concept: write the reaction for the complete oxidation of glucose and calculate the theoretical oxygen demand for 1 g of glucose.
1 Answer
VAVidaara Admin
✓ Vidaara Team
✓ Accepted
· 2mo ago
▲ 31
$$C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O$$
Moles of glucose in 1 g $= \dfrac{1}{180}$ mol
Moles of $O_2$ needed $= \dfrac{6}{180} = \dfrac{1}{30}$ mol
$$Mass of O_2 = \frac{1}{30} \times 32 = 1.067 g O_2 per gram of glucose$$
Log in to post your own answer or join the discussion.
Discussion (4)
S
Why do we take the positive value only in the last step?
A
Brilliant explanation, the substitution step is what I kept missing.
N
Saved me before my mock test. Much clearer than my coaching notes.
VA
Nicely solved. For the exam, write the final boxed answer clearly to avoid losing marks.