How much hydrogen is there in the atmosphere?
451402
None!\n\nAtmosphere is made up of Nitrogen (78%), Oxygen (21%),Argon (0.9%) and other gasses e.g Carbon dioxide, Methane, Rare (inert) gases (0.1%)
834076
Air is about 20% elemental O2.\n\nhttp://www.mountainflying.com/oxygen.htm This site says 21%\nAnd this site:http://www.pubquizhelp.34sp.com/sci/air.html has a nice chart on it.
650823
Carbon, Hydrogen, and Oxygen.
598989
The amount of hydrogen by mass in water is 1/9.\nLiquid hydrogen has a density of roughly 1/14 that of water.\nThus the volume of liquid hydrogen would be 14/9 gallons, i.e. more by volume than you started with (Sounds wrong but it's true).\nIf you want me to convert it into terms of weight you'll have to use SI units. I always though a gallon was a warship they had back 400 years ago.
827237
Hydrogen\nOxygen\nCarbon\nNitrogen\nPhosphorus\nSulphur
382819
There are an estimated 325 to 330 million cubic miles of water on Earth, and of that about 3,100 cubic miles exists as water vapor in the atmosphere.\n\nSo the answer to your question is "Nay nay", but it was a good question.
370942
the atmosphere is contains about 380ppm CO2 (.038%) which is up from about 280ppm (.028%) which is what is is estimated at 100 year ago. Water is still by far the majority green house gas though.
45254
Although in the 1950s' experiments, the early atmosphere of Earth was thought to be highly reducing, with methane, ammonia and hydrogen, currently many researchers consider that this early atmosphere was not so reducing, and it was dominated by carbon dioxide (CO2) rather than methane (CH4), and molecular nitrogen (N2) instead of ammonia (NH3). There would also have been sulphur gases from volcanic activity.
769142
Easy: the molecular mass of a water molecule has 2 hydrogen atoms and 1 oxygen whereas a normal parcel of air is mostly oxygen and nitrogen.\n\nMoist air will be lighter at 18 and 28.98 for dry air.
740908
Not at all.\n\nHelium makes up about 0.0005% of the total mass of the earth's atmosphere.  This has been relatively consistent over the years (since measurements began in 1957).\n\nRecently, the human uses of helium have increased and commercial sources have raised prices rather than increased production.
17392
At the moment it's Oxygen. It's part of "all I need is the air that I breathe"\nhttp://www.lyricsfreak.com/h/hollies/65683.html\n\nIn awhile it will be both Hydrogen and Oxygen for a drink of water.\n\nAt dinner tonight add Carbon, Nitrogen and various trace elements in the New York Cut Steak!\n\nFor info on any element click on the Periodic Table of Elements at this site.\nhttp://environmentalchemistry.com/yogi/periodic/
147599
it's vital in organisms. hydrogens make up the three most important types of molecules to human beings: carbohydrates, proteins, and fats.\n\nthey are trying to develop cars that run on hydrogen fuel.
833318
Hydrogen.  To be more specific, the H1 isotope.  The deuterium or H2 atom is only one in eight thousand of all hydrogen atoms.\nThe second most common element, helium, is less than 10%.  All others together are a minor component, no matter how important to us.
406464
Yes.  There is a very small amount of matter that enters the atmosphere from space (meteorites), but essentially it is all just being recycled. Some atoms of oxygen you breathe in may have been breathed by a dinosaur, or one of the pharoahs!
367911
For example, hydrogen burns in oxygen to form water vapor. \n\n2H2(g) + O2(g) -> H2O(g) \nHow much hydrogen must be burned to form 1.00 L of water vapor at 1.00 atm pressure and 3000C? \nTo work this problem, we need to figure out how many moles of water vapor we need to form. Use the ideal gas equation to compute this: \n\nPV = nRT \n1.00 atm * 1.00 L = n*0.0821 (L*atm/mol*K)* 473 K \nn = 0.0258 moles \nThus, we need to form 0.0258 moles of water. Now it's just a basic stoichiometry problem: for each mole of water formed, you need 2 moles of hydrogen gas, so 0.0258 moles water * 2 moles H2/1 mole water = 0.0516 moles of hydrogen \n\n=====================================================\n\nthis will help you a lot\n\nhttp://www.chem.hawaii.edu/asato161/Ch10NotesP2.pdf#search='Gas%20Stoichiometry%20PV%3DnRT'\n\nhttp://members.aol.com/profchm/gasstoic.html
291231
H2O...two parts hydrogen and 1 part oxygen in each of the water molecules.
821696
The answer, interestingly enough, is not zero.    ( In the following 3 E 5 means 3 times ten to the fifth...   3 followed by five zeros. )  \n\nOxygen and carbon in the air get cycled in and out of plants and animals, burned in fires, etc etc.  But in general the Nitrogen just hangs around. \n\nThere's been plenty of time since cesear for perfect mixing, so we can ignore that....  \n\nNitrogen is 80% of the air...  but for the purposes of this discussion, let's ignore that too.... \n\na breath is between 1 and 2 liters, but let's go with 1 since it simplifies the math. \n\nWe can pretend for the purposes of discussion that the air is about 5 kilometers thick...  or would be if it was all at one pressure. \n\nand the surface area of the world is   5 E 8 square kilometers. \n\nso, we have 2.5 E 9 cubic kilometers of air, or 2.5 e 15 cubic meters, or 2.5 E 18 liters of air around the earth. \n\nSo, each of our breaths uses 4 E -19 of the earths air.  \n\nNow, go back to that last breath of cesear's.  \n\nRemembering the definition of a mole, 22.4 liters of air contain 6.023 E 23 molecules of the stuff air is made of.    So, one liter contains 2 E 22 molecules of air-stuff \n\n2 E 22 times 4 E -19  gives 8000  (8E3)  -- and most of that diatomic.  Throw away 20% (the carbon and the oxygen and you get 6000 nitrogen molecules, or 12000 atoms \n\nor there abouts.  \n\nThis is a classic "fermi question" -- useful for developing estimating skills