If 10 grams of hydrogen is burnt with excess oxygen, then how much water will be formed?
If this is a numerical problem, then the answer is that 10g or 5 moles of Hydrogen react with 2.5 moles of Oxygen to form 5 moles of water, or [math]5×18=90g[/math] of water. Here is the required reaction:[math]H_2(5 mol.) + \frac{1}{2}[/math][math]O_2(2.5 mol.) \rightarrow H_2O(5 mol.)[/math]In reality, if 10g of hydrogen is burned with excess Oxygen, instead of water, Hydrogen Peroxide would be formed.And stoichiometrically, with 10g of Hydrogen, that is 5 moles of Hydrogen, 5 moles of [math]H_2O_2[/math] would be formed. That is [math]5×34=170g [/math] of [math]H_2O_2[/math]Here is the required reaction:[math]H_2(5 mol.) + O_2(5 mol.) \rightarrow H_2O_2(5 mol.)[/math]
Can Hydrogen Peroxide expire?
Yes, hydrogen peroxide decomposes spontaneously into water and oxygen. The decomposition is enhanced by exposure to heat, light, and contaminants. So, over time, that bottle of 2% peroxide in your medicine cabinet will become nothing more than water (not that water is a bad thing).
Why does Hydrogen burn with "pop" sound?
When we say hydrogen is “burning”, it is actually undergoing a chemical reaction where it combines with oxygen to form water releasing a lot of energy.2H + O -> H2O + energyDo not confuse with nuclear fusion which is a physical reaction, not a chemical one.Hydrogen combusting with oxygen from the airAverage energy density of 1 kilogram of substance in kilojoulesAs you can see a lot of energy is released by hydrogen when it combusts, and most of this energy is released in the form of heat.Heat causes gases to expand, and since a lot of heat is released the gaseous mixture (hydrogen, oxygen remaining from and water vapour liberated from the reaction) and the air adjacent to it expand very quickly, so quickly that the gas molecules break the sound barrier.That is the “pop” sound that you are hearing.
Is there oxygen located underground? If so, is it possible to bring it to the surface absolutely pure?
You specify that you want pure oxygen gas to come to the surface from the crust and below. Well this would be incredibly difficult! This is because the conditions as soon as you go even 5m below the surface are not thermodynamically favourable for gaseous oxygen. Oxygen may be one of the most abundant elements within the mass of the earth, however almost all of it not in the atmosphere is locked away in oxide minerals or other fluid phases. I like your idea, but its not really feasible. However I would like to propose a counter argument Why do you need to produce the water at the surface? Water exists as a fluid phase even deep within the mantle. Certain tectonic settings will have a greater abundance of fluids; you only have to look at hot springs and geysers to realise this. Within the crust water can be found in aquifers that is incredibly 'pure'. Besides, you have to put more energy into producing water from its constituent elements in a lab than it costs to drill a borehole to get it out of an aquifer. You can then fractionally distill this to control its content and get it as pure as you like. Another gasesous phase that you might like to consider is CO2. Depending upon the tectonics and conditions in the earth; you can get this pretty easy as a fluid phase in the earth. The only problem with all of this is that fluids exist as partial pressures. It's very rare to find a pure form of anything in the earth. Thermodynamics simply don'f favour such differentiation of elements.
Can we make water...?
If you burn hydrogen in oxygen the result is water (2H + O = H2O). If burned too rapidly (in a tank) there will be an explosion. Fuel cells combine hydrogen with oxygen in a controlled manner to produce water, heat and electricity as end products. Your body produces metabolic water when the oxygen you breathe combines with the carbohydrates (carbon + hydrogen) of food to produce H2O + CO2. Whales are mammals that cannot drink salt water but produce enough metabolic water to survive in the salty oceans by breathing in air and 'burning' blubber.
Why can't cars run on water?
You can run cars on water. There's been plenty of proof of concept water powered cars. Electrolysis based systems are notoriously inefficient but Stan Meyers, a pioneer in this field, developed a technique where the current was fed into the circuit in a cyclic ramped pulse which excited the molecules into separation with a smaller current making a closed system possible. The reason Hydrogen fuel cell systems are being pushed is that it requires the user to still purchase the fuel from a vendor. When you think about it, petrol is effectively a tax on life, even if you don't own a car your food usually travels, any goods transported require fuel therefore everything in life is effectively taxed. Free energy systems have always been suppressed for this reason, the patents horded by fuel companies, and inventors threatened and even murdered by jealous competitors. The oil companies aren't even calling the shots, its above them, oil is just a method of profit and control of the masses Advanced battery technology is also highly suppressed. See the documentary "Who Killed the Electric Car" to explain why car makers don't release this technology. Basically, oil companies buy the patents and suppress them, the batteries infringed on a patent owned by Chevron and all the cars got compacted. You might have heard of Tom Hanks complaining a late night talk show about his electric car getting taken away from him. You probably don't know of an inventor of a revolutionary battery technology found slumped over the wheel of his car not so long ago. Attached is a link to a Japanese water powered car video. There was a GM pure salt-water drive-by-wire concept car featured on Top Gear, link below.