CaptainPanic

About question 2, What is STP? I can't find the solution which gives the answer 9.34 liters. And I(should) know how to use the ideal gas law, and partial pressures. About question 3 part 1: 10 meter water = 1 bar 7.2 cm water = 720 Pa = 5 mm Hg (you can also say: the density of Hg is 13.5x the density of water: 7.2/13.5 = 0.5 cm = 5 mm. So, the pressure is lower because the pressure is higher. This means that the pressure is 775 - 5 = 770. About question 3 part 2: The partial pressure of water at 27 deg C is 26.74 mm Hg P(water) = 26.74 mm Hg P(total) = P(water) + P(dry gas) P(dry gas) = P(total) - P(water) = 770 - 26.74 = 743.3 mm Hg About question 3 part 3: Again, I cannot figure it out. What's this STP?

I'll try to rephrase Cmac22's question (and he should correct me if I did wrong here). At which place in the universe did the big bang take place? After the big bang, everything started to expand, in every direction. It's like a firecracker... the firecracker is the center of its own explosion, but after it exploded the little pieces are all over the place, but they are distributed in a circle (or sphere) around the place where the firecracker originally was. I personally believe that there was space at the moment of the big bang. An infinite space around some sort of mega-supermassive black hole. The big bang was nothing but a black hole which spit out all its matter. According to my view, there is a center, namely where the supermegamassive heavy black hole was when it blew up. (Sorry for inventing my own words here). Undoubtedly others have a more complex view. I'm a chemical engineer, and I think of the world and universe as a thing you can touch, and as a place which works according to our earthly laws of physics (those laws you can see with your own eyes and feel with your hands).

And about the conditions... it will always react. So, you need "wet conditions" since you'll need water. But you had already put that in the original question. Other conditions (temperature, pressure) are quite irrelevant. If I really search for that one condition where it will not react: a perfect vacuum. The water will all evaporate, and without it, the reaction does not proceed. The reaction you entered is indeed slightly wrong. Count the H, O and Na on both sides of the arrow. These must always be the same. (This is called "stoichiometry"). Wikipedia it to get a good explanation.

New too. I'm a chemical process engineer, recently started working after finishing uni. (Where are the engineering threads?)

I'd advise you to study the abbreviations. H = hydrogen, He = helium etc. Most are easy to remember, but you'll see that Sn = tin, Fe = iron, that's harder already, but still these are common elements. There are some "weird" abbreviations (logical only if you know the history behind it). I still Google the table sometimes if I'm not sure about some details. No problem with that I think. (Better safe than sorry).