Nitrogen Definition and 220 Threads

Hi All, I tried to find entropy of liquid nitrogen in various data books, using nitrogen's CAS number, MSDS, but I was able to get the entropy of nitrogen till only 100K, not below that. Does anyone know what's the entropy of liquid nitrogen or that where can I find it? Thanks!

Is there a chemical that can absorb oxygen and nitrogen and in solid form. I need to make a vacuum in a pvc pipe or close to a vacuum. I was wondering if there were some chemicals that I could insert into the pipe and then close the end and tip it over and mix the chemicals together that...

hi all How would nitrogen behave at 3000psi? or 6000psi? assuming it starts at liquid form and at 1 atms pressure heated to 20 Celsius. thank you

I've read a lot of articles about neutral nitrogen and its properties, but I was wondering if it was or has the same properties as nitrogen gas, N2? Like in regards to its emission/absorbtion spectrum, is it the same as the emission spectrum of N2 gas? thanks

if so is the only way to obtain it is to increase pressure and decrease pressure, and how long can it be maintained because online it says it can only exist for a microsecond, but if pressure and temperature is maintained why can it not be maintained longer

Why don't they tend to stay as they are?

Im working on an exisiting Ntirogen supply system that's used to blanket boilers and pipelines etc. at a thermal power plant. I am trying to determine the capacity of the system. I have determined the size of the liquid ntrogen tank to be 8m^3 but I'm lost on how to determine the amount of gas...

What is the "first positive", "second positive", "first negative" systems of nitrogen Hello, I have been trying to catch up on spectroscopy theory, and I'm trying to get a grasp on what all the terms mean. I constantly seem the terms "first positive system", etc... coming up, and I'm not sure...

Homework Statement You come into lab one day and find a well insulated 2000mL thermos bottle containing 500mL of boiling liquid nitrogen. The remainder of the thermos has nitrogen gas at a pressure of 1.0atm. The gas and liquid are in thermal equilibrium. While waiting for lab to start, you...

Homework Statement how many possible quantum states for a nitrogen atom with electronic configuration of 1s22s22p3 Homework Equations ? The Attempt at a Solution So, the answer for this question is 20, but I can't for the life of me find out how. The book we're given is...

Homework Statement I understand that the hybridization of, say, ammonia is sp3. I see that the nitrogen atom of pyridine is sp2. I don't understand why the nitrogen of pyrrole is sp2. I understand that it is aromatic and thus must be sp2. But there are three bonds and one lone pair which...

Homework Statement I undertook a practical experiment where a back titration was used to determine the amount of nitrogen in fertiliser.My titres are 3.9, 3.7 and 4.2 So I know this reaction occurred: NH4+ + OH- ---> NH3 +H2O I then boiled the solution to expel the Ammonia and the excess OH-...

Hi all - looking for help as a metallurgist - not a chemist. For a powder metallurgy project I need a simple, solid, powdery nitrogen compound I can mix with metallic, compacted powder and heat to 500 deg C. I need it to liberate nitrogen to react with the metal surfaces. I was looking at...

Homework Statement Estimate the precise value for the specific heat of a nitrogen molecule at T=13.6K Homework Equations I'm pretty sure the correct equation is: Cp = (7/2)*R + R((hv)/(kT))2 *((e(hv/kT))/(e(hv/kT)-1)2 So R=8.314 J K-1mol-1 T=13.6K h=6.626*10-34m2kg s-1...

Homework Statement Nitrogen at a pressure of 100 psia and a temperature of 300 F flows through a circular pipe with a diameter of 6 inches. The velocity profile is parabolic with V= [1-(r/3)^2] where r is the local radius in inches and V is the velocity in ft/s. Determine the mass flow rate...

Homework Statement Experimental evidence suggests that the nitrogen atom in ammonia, NH3 , has four orbitals in the shape of a pyramid or tetrahedron. Draw an energy-level diagram to show the formation of these orbitals. (Hint: No electron promotion is required.) Homework Equations...

How much liquid nitrogen? Hi All, A liquid nitrogen evaporation question for you :) A large metal container is kept at constant temperature of 40 degrees Celsius. This container has a long 10inch diameter tube opening connected to its top. Through a second opening liquid nitrogen...

Homework Statement The problem is that we need to calculate, how much time it takes for nitrogen to evaporate. Given data: dewar flask is in a room, where is T= 293K temperature; In such flask m=0,2 kg of Hydrogen would evaporate in t= 3600s. Also there is given boiling point temperatures for...

I am pondering on what the correct Lewis structure(s) for Nitrogen Dioxide (NO2) may be... I have come up with 7 possible structures, but am unsure which are correct and which are not. I have compiled a small list of notes for your convenience and they are all in this picture. Which...

Hello everyone! I am trying to design a magnetic testing apparatus that needs to remain at -196K for 20 minutes. There is not exactly a straight foreword equation to get a calculation for the evaporation rate of liquid nitrogen. The apparatus looks like this, and I have highlighted the area...

Nitrogen is a lewis base because it has a lone pair of electrons with which to form bonds with electrophiles. Oxygen has 2 lone pairs of electrons and halogens have 3. Why doesn't oxygen use any of its spare pairs of electrons to react with electrophiles?

I have read in a lot of places the PAN acts as a very good reservoir of nitrogen dioxide. I can't find much information on why though. All I have found is that PAN is thermally unstable and has a very short lifetime at typical tropospheric temperatures, but becomes much more stable at lower...

Homework Statement Lowest energy term symbols for Nitrogen Homework Equations L=l1+l2, l1+l2-1, l1-l2 S=s1+s2, s1-s2 J=S+L, S-L The Attempt at a SolutionSo I think I'm doing this right up until finding the J value. So the configuration of nitrogen is 1s22s22p3, so were working with 3...

Is it possible to freeze liquid in tank with compressed nitrogen? Tank has double sides where nitrogen is relased. Also there are numerous nozzles inside tank through which nitrogen spray. Would be final result solid form of liquid? What is difference in time, amount of nitrogen needed for 50...

I just thought I would ask some people's opinions about this as I am stuck on what to do. I am currently working for a food manufacturing company that pack their food with nitrogen gas to increase shelf life. However they have an acceptable limit of how much nitrogen can be within the...

Homework Statement . A nitrogen in the container (molar mass is 28 g/mol) has a pressure of 2.5 atm, a volume of 0.2 m3, and a temperature of 300C. What is the mass of the nitrogen? A. 125 g B. 258 g C. 421 g D. 582 g E. 864 g Homework Equations I'll show you EXACTLY what i am...

Homework Statement Suggest one way to yield ammonium salt of ephedrine from reactants phenacetin and ephedrine . In the ans. consider both phenacetin and ephedrine as containing nitrogen. Explain why they would differ in reactivity and solubility. Homework Equations - The Attempt...

What would a lifeform that carried nitrogen in blood instead of oxygen be like?

Only assuming that the worst will happen and that will include the complete breaches through the bottom of the sealed containment of all four reactors, wouldn't it be possible, first, and then prudent, second, to be ready to cool these molten masses with liquid nitrogen being injected...

Greetings. I've been reading papers on plasma kinetics and have come across the term "shape resonance" a few times when describing peaks in electron impact cross section (function of energy). I have seen calculations attempting to explain these for atoms like helium but I'm not sure how close...

Homework Statement Just need someone to confirm whether I am right for this (The prac is using back titration to find the amount of Nitrogen in Fertiliser) How would the following affect your experiment: Burette, pipette and volumetric flask are rinsed with the wrong solution i.e water...

Hi there, I'm a first timer on this forum and am hoping to get some help. Homework Statement 4.00×10^23 nitrogen molecules collide with a 18.0 cm^2 wall each second. Assume that the molecules all travel with a speed of 350 m/s and strike the wall head on. Homework Equations F...

I was thinking about how you'd hybridize oxygen and nitrogen orbitals (should be pretty straightforward), but I was getting confused. It's clear to me for carbon binding to 3 atoms with a double bond on one (say C in benzene ring: electron from 2s gets promoted to 2p, then you have 3 sp2...

Dry air contains roughly (by volume) 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%. From Wikipedia, Earth's Atmosphere Is possible for a human to breathe in an...

Homework Statement Pyridine and pyrrolidine react rapidly with dilute aqueous HCl to form the corresponding hydrochloride salts which are easily purified, isolated and stored in a charge. However, pyrrole, which is another nitrogen-containing heterocycle, does not form a hydrochloride salt...

Why don't they use nitrogen for welding instead of argon . Unless it does something to the metal . Nitrogen seems like it would be cheaper than argon .

I need some help in calculating the specific volume ( in cubic metres per kg) of Nitrogen at various temperature + pressures. Eg, at 100.73K and 817kPa. Can anyone please point me in the right direction ?

Homework Statement At 0C and 1 atm pressure the densities of air, oxygen and nitrogen are 1.293, 1.429 and 1.251 kg/m3. Calculate the percentage of nitrogen in air, assuming only these two gases to be present. The Attempt at a Solution Which equation should we use here?

Which is more electronegative, nitrogen or chlorine? Most of what I hear or read says that nitrogen is more electronegative. However, oddly, most electronegativity charts I see show chlorine with a slightly higher value. Why is this?

Can anyone recommend a white light source to be used in a cryostat down to 77 K? We are using it in temperature-dependent studies of PV devices. Currently we have an incandescent bulb which has shifted its spectrum towards red over time and we're looking for a replacement. It would be nice to...

i'm trying to figure out the expansion rate of nitrogen at any given psi in room temperature. roughly in fps. trying to calculate how fast we can move a piston arm to get maximum velocities

Homework Statement Calculate the mass of nitrogen dissolved at room temperature in a 92.0 L home aquarium. Assume a total pressure of 1.0 atm and a mole fraction for nitrogen of 0.78. Homework Equations PV=nRT The Attempt at a Solution P_{total}=1 atm P_{N}=.78 atm V=92LSo here is what...

This is not homework, but a problem from work. If 4 tanks with fixed 90m^3 volume contained Nitrogen gas at 701.3 kPag were purged to 131.3 kPag through a 100mm pipe how would I work out the velocity/volumetric flow rate of the output? Thanks

I'm supposed to do a little demonstration to some middle school kids and one thing that's planned is sticking a balloon in liquid N2. The guy who showed us what they want (who doesn't appear to know anything about science) claimed that the liquid you see in the bottom of the balloon when you let...

I know the undeniable substantial applications of cryogenics fluids in engg. sciences, but can't hold on how these fluids are cooled or liquifed from gaseous state??

I remember seeing a physicist on TV putting an argon or nitrogen sealed glass tube in a microwave and when he turned it on the tube started flashing an emitting visible light, So how come when i put a sealed glass jar that i glued a lexan lid on in the microwave it does not emit light , i...

Hey, I saw a documentary about the first Nitrogen powered plane. It was being developed in Germany and is more a prototype than anything else. They said one of the problems is that the tank is insanly expensive for liquid nitrogen but "Cheap" for nitrogen gas. Well I don´t understand why it...

Homework Statement 1.5 is a typical walking speed. At what temperature would nitrogen molecules have an rms speed of 1.5 ? Homework Equations V=(3*K_b*T/m)^.5 V is the rms speed K_b is Boltzmann's constant T is temp in kelvin m is mass The Attempt at a Solution I am...

1. The average translational kinetic energy of a nitrogen molecule at temperature is _____ check picture 2. 3. The Attempt at a Solution : since nitrogen is diatomic then it has 5 degrees of freedom and therefore the average kinetic energy wouldn't be 3/2kt it would...

I'm constructing a pulsed solenoidal accelerator (coilgun) and am looking to boost efficiency by supercooling the copper wire in the coil. I'm also getting a quote for a high-temperature superconductor film to use in place of the copper wire. In either case, I will need submerge the coil in...