Oxygen Definition and 360 Threads

Homework Statement What is the total mass (in grams) of oxygen in a room measuring 4.0 by 7.0 by 2.5? Assume that the gas is at STP and that air contains 20.95% oxygen by volume. The Attempt at a Solution I don't know where to begin.

Which size of the molecule is bigger? Water or oxygen? Can someone state out the size unit of these molecules And, can I find a meterial to separate this 2 matter but let one of it pass through the other? (Osmosis effect) Really appreaciate who can help out here, thx

Hi, I have learned that pi-donor are those ligands which donate their pi electrons to metal centre while pi-acceptor accepts electron from filled d(pi) orbital to their pi* orbital. Now, I'm confused, why oxygen, having two pi* electrons cannot act as a pi-donor while NO, having one pi*...

Methemoglobinanemia is when the iron atom in the heme group of hemoglobin is oxidized to the +3 state. In this oxidation state, the heme group is unable to carry oxygen. Why is this? A ton of the sources I have come across explain the condition of methemoglobinanemia and simply say that the...

if air is made up of only 2gases oxygen and nitrogen, and the molecular mass of air is 29g/mol, find the % of each component in the air, what i thought i should do is make 2 equations, Mw(O)=16 Mw(N)=14 X*16 + Y*14 = 29 (in 1mol of air) X + Y = 1 but the solution to this is not...

Homework Statement A welder fills a tank, volume 7.60 x 10^-2 m^3, with oxgyen (32.0 g/mol) at gauge pressure 3.25 x 10^5 Pa and temp. 36.0 degrees C. The tank has a small leak, and some of the oxygen leaks. When temp. is 22.4 degrees C, pressure of oxygen in tank is 1.80 x 10^5 Pa. Find...

How many energy levels the oxygen atom have? What energy (in eV) is required to get to each level. From my research i have only been able to find the first two levels, the first of which is a forbidden level. 1.=.98eV 2.=1.63eV

How could the Oxygen atom be stripped of at least 4 electrons and excited at the least to it's 4th energy level? I came across a device which claims to do this with Solid State Lasers (LED's) and a high voltage oscillating field...Just wondering how it would work since LED's only go to...

hydrogen peroxide can decompose to water and oxygen by following reaction: 2H2 O2 (l) = 2H2 O(l) + O2(g) deltaH= -196kJ CALCULATE THE VALUE OF q when 5.00g of H2 O2(l) decomposes at constant pressure. my answer is -14.4J...can some please tell me how to do this again...

Homework Statement A compound contains only carbon, hydrogen, nitrogen, and oxygen. Combustion of 0.157 g of the compound produced 0.213 g CO2 and 0.0310 g H2O. In another experiment, it is found that 0.103 g of the compound produces 0.0230 g NH3. What is the empirical formula of the compound...

How is oxygen partial pressure measured? Can a mass flow controller (MFC) be used to control it? If so, what is the relationship between flow [sccm] and pressure [Pa]? Thanks!

I've heard that breathing pure oxygen is bad for you, but I can't find any information about it online. Is it bad? Do scuba divers and astronauts breathe pure oxygen or is it diluted with other gases?

Would an acidic "atmosphere" remove oxygen from the area it affected? By that, I mean, if you could make an area of air acidic, would it suck oxygen away from the surroundings?

Homework Statement (a)What is the mean free path for oxygen molecules at 300K and atmospheric pressure (105 Pa) and the average frequency of collisions for a particular molecule? (The diameter of an oxygen molecule is 0.29 nm). (b)What is the mean free path of oxygen molecules at an...

leaking air?? Homework Statement Suppose we make a circular hole 3 millimeter in diameter in a balloon. Calculate the initial rate at which oxygen escapes through the hole (at 0° C), in number of oxygen atoms leaving the balloon per second. Homework Equations i used 1/4 nAv where n...

Hey all, I'm a science thriller author (www.jeremyrobinsononline.com) and I've got a new story idea with a really big problem. Basically, I need to remove all of the oxygen from Earth's atmosphere, preferably fast, but I can adapt to a longer time frame if need be. Now, this is for a novel so...

organic evolution took place in the absence of oxygen...if so, how oxygen came on earth??

Homework Statement A cylinder of compressed Oxygen is carried on a spacecraft headed for Mars. The compressed gas cylinder has a volume of 17000 L and is filled to a pressure of 248 atm at 231 K. The maximum pressure the cylinder can hold is 1000 atm.The contents of the cylinder are then...

Hello, I'd like to ask a question about the electron binding energies of oxygen atom. As is known, when an oxygen atom gains one additional electron to form an anion with charge -1 it gives some 1.4ev, while it gives nearly 7.8ev if two additional electrons are bound to it. Considering that the...

http://www.sciencedaily.com/releases/2009/01/090129140849.htm here is a link to what I am talking about. Does this mean that some of these worm cells (the ones that have been made to survive in the low oxygen environment) can survive with no oxygen? indefinitely? or does it definitely not mean...

Homework Statement Insects do not have lungs as we do, nor do they breathe through their mouths. Instead, they have a system of tiny tubes, called tracheae, through which oxygen diffuses into their bodies. The tracheae begin at the surface of the insect's body and penetrate into the...

Is the inside of the eye ball empty space? Or it is filled with oxygen?

in the middle of the sea where there are no trees around?.

Homework Statement The water molecule forms an angle, with hydrogen atoms at the tips and the oxygen atom at the vertex (see diagram in the previous problem). Assume that the angle at the oxygen atom is Θ = 103.5o and the distance between the oxygen and the hydrogen atoms is d = 93.1 x 10-9...

Homework Statement A container holds 1.50 g of oxygen at a pressure of 9.00 atm. How much heat is required to increase the temperature by 108^\circ C at constant pressure? C_p (specific heat of oxygen for an Isobaric process) = 29.2 Homework Equations 1LoT for Isobaric process...

I was just wondering becasue every example in my book had oxygen in it, but it didn't say anything about it.

Hi all,sorry if i commit any mistake while asking this question. Actually right now i am studying FEYNMAN lectures of physics vol.1.ON page 7 of chapter1 it is written and clearly understood that Carbon attracts Oxygen much more than carbon attracts carbon or oxygen atttracts oxygen. But if...

Homework Statement 6CO2 + 6 H2O → C6H12O6 + 6 O2 Now suppose the above reaction is allowed to proceed in both directions, and has reached equilibrium. How would increasing the concentration of oxygen change the concentrations of carbon dioxide and sugar? Homework Equations The Attempt at a...

Homework Statement A welder using a tank of volume 7.50×10−2 m^3 fills it with oxygen (with a molar mass of 32.0 g/mol) at a gauge pressure of 3.00×105 Pa and temperature of 37.1 C. The tank has a small leak, and in time some of the oxygen leaks out. On a day when the temperature is 23.4 C...

The pressure gauge on a tank registers the gauge pressure, which is the difference between the interior and exterior pressure. When the tank is full of oxygen (O2), it contains 15.0 kg of the gas at a gauge pressure of 41.0 atm. Determine the mass of oxygen that has been withdrawn from the tank...

I am on home oxygen and receive the gas through a 50feet long tube about .1" inside diameter.If the Machine delivers a flow rate of two liters per second, what is the pressure drop through the tubing; What is the flow rate at my end of the tubing?

Is the surface area of the alveolar capillaries comparable to that of all other arterial capillaries?

2 quick ochem questions... 1. Why is a carbon oxygen double bond more thermodynamically stable than a carbon oxygen single bond? 2. Can -OH be a leaving group in basic conditions, it would seem strange to protinate it in basic conditions? Thanks!

Homework Statement Given that 1,206,900 liters of oxygen are required for a round-the-world trip for a hot-air balloon with a crew of three, and given that carbon-fiber wrapped bottles have a maximum pressure of approx 4500 psi, what total volume of pressure vessel would be necessary to...

[SOLVED] Blast furnace and oxygen converter FACT: Scrap metal is added to the basic oxygen converter to control temperature in the production of steel from pig iron. QUESTION: How can one control the temperature in the production of pig iron in the blast furnace? Scrap metal or something?

This was prompted by another thread which got me thinking. If CO2 levels are increasing then surely O2 levels must be decreasing? I mean I am just going by basic chemistry, we have hydrocarbons (fossil fuels) where are being burnt and I believe the basic formula is:- Hydrogen and...

I've googled quite a bit. Other than finding articles that require payment to view I have found nothing usable. I need a source - possibly a table would be best - of estimated oxygen levels since the Cambrian. Thanks. - Reason: the only text I have was out of print during the Eocene...

First off, I know nothing about physics so if this question seems bizarre, that's probably why! In theory, are there conditions that would permit electromagnetic energy to block or limit the passage of oxygen (normal, everyday oxygen levels)? Is electromagnetic energy denser than oxygen under...

is it possible to separate oxygen from air? in other words, getting pure oxygen from air

Homework Statement A mass of 0.736 kg of molecular oxygen is contained in a cylinder at a pressure of 1.0 × 105 Pa and a temperature of 1°C. What volume does the gas occupy? Homework Equations PV=nRT V=nRT/P The Attempt at a Solution n=(.736)(1000)/16 = 46 V =...

Can oxygen be removed from a liquid using argon gas?

This is not exactly physics, but I'm interested in a physicists opinion: Oxygen is considered a very active substance, very dangerous to many physiological processes of the cell. Even though or maybe as a result of this fact, we know that all life on Earth thrives on reach in oxygen...

how would the Earth be affected by global warming in terms of the sea level , global ocean circulation, and oxygen isotopes?

two questions, If one was to create some sort of suspended gravity embraced in a cylinder, and then send oxygen and small particles of mass through it would the oxygen travel through and the particles deflected? If not could one create a relative situation by using magnetic waves or gamma...

Does salinity decrease the dissolved oxygen concentration in a water sample? For example, if one has two water samples, a freshwater sample and a seawater sample, at the same temperature, will the seawater sample have a lower dissolved oxygen concentration? Thank you.

Homework Statement Lets say at room temp an atom of hydrogen moves at 3000 m/s. Let's say all things the same except you replace the hydrogen with oxygen. The oxygen is about 16 times the molar mass than hydrogen. Does this mean that the oxygen will travel at (1/16)*3000 m/s? The...

[SOLVED] conservation of energy Homework Statement From what height must an oxygen molecule fall in a vacuum so that its kinetic energy at the bottom equals the average energy of an oxygen molecule at 200 K? Homework Equations conservation of energy Eavg=3/2KbT Epot=mgh The...

[SOLVED] Converting Mol 1. A 20-cm-diameter cylinder that is 40 cm long contains 50 g of oxygen gas at 20 degrees celsius. How many moles of oxygen are in the cylinder? so 1 mol = 6.022*10^23 oxygen atomic mass=16g/mol 50g/16(g/mol) = 3.125 mol I don't know why it is wrong...

Currently 241 exoplanets. [URL="[PLAIN]http://en.wikipedia.org/wiki/Gliese_581_c"][http://en.wikipedia.org/wiki/Gliese_581_c/URL][/PLAIN] A few are terrestrial such as Gliese c, d at 5x and 8x Earth mass; sufficient mass to be geologically active, and hence a magnetosphere, diverting a stellar...

Denny Klein has (allegedly) discovered a way to turn H2O into HHO with very considerable energy output. I think this is a different process to the other 'salt water energy' thread so i'll start a new one here. It does look impressively powerful, in just three seconds he turns a large ball of...