an you please solve the questions for me

Question

1. 3 moles of pesticide of molecular mass 200 g/mole is applied to a closed system consisting of 20 m3 of water, 10 m3 of air, 1 m3 of sediment, and 0.001 m3 of fish. Determine the concentration and amount in both grams and mole units in air, water, sediment and fish in equilibrium condition if the partitioning coefficients are: air/water = 0.1, sediment/water = 50, and fish/water = 200,
2. A circular lake of 2 km diameter and 10 m deep contains suspended solids (SS) with volume fraction of 10-5 (i.e. 1 m3 of suspended solids per 105 m3 of water) and biota such as fish at a concentration of 1 mg/l. Assuming specific density of biota as 1, and SS/water partitioning coefficient as 100, calculate the deposition and concentration of 1.5 kg of polychlorinated biphenyl (PCB) in this system.Assume any data not given.
3. Pesticide is applied to a 10 ha (hectare) field at an average rate of 1 kg/ha every month. The soil is regarded as 20 cm deep and well-mixed. The pesticide evaporates at a rate of 2% of the amount present per day and it degrades microbially with a rate constant of 0.05 day-1. What will be the steady state concentration of pesticide in g/m3 and in unit of ƒÝg/g, assuming the soil density as 2500 kg/m3.
4. The first order reaction rate constant of a herbicide is 0.002 h-1. A lake of 100,000 m3 volume is treated with 12 mol of herbicide. What will be the concentration after 2 days and 20 days, assuming no further input. What is the half-life of the chemical?
5. A lake receives 8 m3/s of inflow containing 0.3 mol/m3 of a chemical. The chemical reacts with a first order rate constant of 0.01 h-1. The outflow from the lake is also 8 m3/s. What will be the concentration of chemical 5 days after the start of the input. Assume there was no chemical in the lake at the beginning and volume of the lake is 106 m3.
6. A stoppered flask at 25 0C contains 250 ml water, 200 ml octanol, and 50 ml of air. An unknown amount of o-xylene is added to the flask and allowed to partition among the phases. After equilibrium has been established, 5.0 mg of o-xylene are measured in the water. What is the total mass of o-xylene present in the flask?