Solved problem-1:
Estimate Theoretical Oxygen Demand (ThOD) for the following three following samples:
a. Sample containing 500 mg/L of sucrose (C12H22O11)
a. ThOD of the sample containing sucrose
Stoicheometric equation for the oxidation of sucrose is
C12H22O11 + 12O2  12CO2 + 11H2O
12 moles (364 grams) of oxygen is required for oxidizing one mole (342 grams)
of sucrose
Sucrose concentration of the sample = 500 mg/L
ThOD of the sample =
500 mg / l X 364 grams
 532 mg / L
342 grams