need distance given constant rate of leakage?

A certain pesticide is fatal to fish fingerlings at a level of 0.5 parts per million in water. A leaking metal can containing 2.0 kg of the pesticide was dumped into a stream with a flow of 10.0 Liters per second moving at 1.9 km/hr. The container leaks pesticide at a constant rate of 5.0 mg/sec. For what distance (in km) downstream is the water contaminated by fatal levels of the pesticide by the time the container is empty? Hint: Calculate volume of water contaminated, length of time to do this, distance I can't find any examples in my book or study guides. Please need answer and formulas used to get to it

Henry's Law, need rxn rate of diff measurements given volume

Consider the following aqueous route to oxidize SO2: SO2(aq) + H2O2(aq) -> H2SO4(aq) k = 1.1 X 10^3 L/mols a. The partial pressure and Henry's law constants for SO2 and H2O2 are 2.7 ppm (KH = 1.2 mol L-1atm-1) and 4.9 ppb (KH = 1.0E5 mol L-1atm-1), respectively. Calculate the reaction rate of this process. b. Calculate the reaction rate (per liter of air) if the amount of liquid water in the atmosphere is 0.008 g L-1. Hint: Calculate volume of water contaminated, length of time to do this, distance I downloaded a study guide and attempted it 3 times but was wrong.

given Eh and pH, calculate dissolved oxygen in ppm

A ground water sample , at 25 C, has Eh= 0.6 and pH=6.40. Assuming the system is at equilibrium, calculate the amount of dissolved oxygen (ppm) in the groundwater sample. Hint: [O2-aq]/[O2-g]=0.0012589

Basic chemistry questions

mainly comparing chemicals/compounds properties (See attached file for full problem description)

concentration of Fe2+ in equilibrium with Fe(OH)3

At pH 6.00 and pE 2.60, what is the concentration of Fe2+ (mol/L) in equilibrium with Fe(OH)3? Use the Nernst equation and the Ksp for the solubility of solid iron (III) hydroxide.