Kindly answer both of the questions there in the attached picture related to Con

Question

Kindly answer both of the questions there in the attached picture related to Contaminated Site Management!

A glass jar contains gasoline floating over water. The gasoline contains over 400 organic chemicals including toluene, which is present in the gasoline at a concentration of 5.6 percent by volume (i.e., mg/L). What is the approximate effective solubility of toluene in the water? Show your calculations. Assume: specific gravity of gasoline = 0.83 toluene: Molecular Weight = 106.17 g/mole Aqueous solubility = 515 mg/L Specific Gravity = 0.867 Log Kow = 3.13 Henry's Constant = 0.0066 atm-m3/mole If after 510 days, sixty percent of a compound has biodegraded, what is the half-life of that compound? Contaminated Site Management

Explanation / Answer

Q2) A[t] = 0.4Ao

ln[Ao/0.4Ao] = k*510

ln(2.5) = k*512

k = ln(2.5)/512

Half life: ln2/k = ln2/ln(2.5)*512 = 387.31 days

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