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

At pH 6.00 and pE 2.10, what is the concentration of Fe2+ (mol/L) in equilibrium with Fe(OH)3? Hint: Use the Nernst equation and the Ksp for the solubility of solid iron (III) hydroxide.

Petroleum

Why is lip gloss long lasting containing petroleum? What does petroleum do to lip gloss?

Carbon release from octane

Assume the average American car is driven 10000 miles/year. How much carbon (in lbs) is released into the atmosphere by this car? Assume gasoline is octane, with a density of 0.692 g/mL. Assume the car mileage is 21 miles/gallon.

How much energy is required for wattage.

If a customer replaces a 85 watt bulb with an 20 watt compact fluorescent bulb that lasts 5000 hours, how much less coal (lbs)will be used to generate the electricity that is saved? Assume the electricity is generated with 30% efficiency and the energy content of the coal is 30 kJ/g.

Figures relating to cigarette smoking and cancer

Consider the following approximate figures relating to cigarette smoking and cancer. The death rate in the US population of 260 million is 12 deaths per 1000 persons per year. One-fifth of these deaths are from cancer and one-fourth of the cancer deaths are from lung cancer. Ninety percent of the lung cancer deaths occur among the sixty million people who smoke. How many deaths are there per year in the US from all causes? How many cancer deaths? How many lung cancer deaths? What is the lung cancer death rate among smokers expressed in deaths/yr/1000 smokers? What is the same rate among non-smokers?