Hydrogen gas problem using ideal gas law

Consider a vehicle powered by hydrogen gas. a. About 3.1 kg of H2 is required for a vehicle to have a 500 km range. Assume ideal gas behavior and a storage tank of 60 L (a comparable size to conventional gasoline vehicles). What tank pressure atm might one expect at 25 degrees celsius? b. Since their discovery in 1991, tiny graphite-like cylinders known as nanotubes have been widely researched. These nanotubes (1-3 nm in diameter) have high tensile strength, high electrical conductivity, and a high surface area. Hydrogen can readily abosrb onto these carbon fibers. The textbook indicates that these nanotubes can absorb three times their weight in H2. What minimum amount of this carbon ... click for more

Calculating increase of BOD in water

If 900 kg of n-propanol are accidentally discharged into a body of water containing 1e8 liter of water. By how much is the BOD(mg/L) (biochemical oxygen demand) of this water increased? I don't even know what to do with this problem, please help and show me how to do it step by step... Thanks!

fraction of NTA after equilibrium is reached

What is the fraction of NTA present after HT2- has been brought to equilibrium with solid PbCO3 at pH 7.00, in a medium in which [HCO3-] = 1.75E-3 M? I've been trying to solve this using the equilibrium constant equation, but I just can seem to set it up and solve it correctly. Please help! Thanks!

Amount of coal needed to produce a pH of 2

How many metric tons of 5%-S coal would be needed to yield the H2SO4 required to produce a 5.0 cm rainfall of pH 2.00 over an area of 100 square kilometers? The only hint given was: calculate the volume of rain, mol H+, mass of S, mass of coal. If you could work out the problem for me, that would be great! It makes it easier to understand.

Determining Redox potentials of acid water

What is the redox potential of an acid mine water sample having Fe3+ = 7.00E-3 M and Fe2+ = 3.00E-4 M given that E0 (standard electrode potential) for the Fe3+/Fe2+ couple is 0.77V Again...I have failed at this problem several times so it would be great it you could work it out as well. Hint: Nernst equation.