Gases Definition and 501 Threads

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...

This is actually related to Thermodynamics but as it comes directly under the Mechanical field I'm asking it here and I invite all my fellow Mechanical Engineers and Physics Experts to answer this. The question is : How does the Tempreature of a gas change (increase) when the gas is...

Homework Statement Hg is spilled in a laboratory which measures 15.2m long, 6.6m wide, and 2.4m high. Find mercury vapor in grams at 20C room. Given vapor pressure of Hg = 1.7E-6 atm. Homework Equations The Attempt at a Solution Volume= 15.2*6.6*2.4 =240.768 m^3 = 240768 L Temp = 20 +...

Homework Statement What volume of air (T=25C, P=1atm) is required for complete combustion of one litter of gasoline? The partial pressure of oxygen in the air is 0.205 atm. One litter of gasoline contains 6.15 moles octane C8H18. Homework Equations The unbalanced reaction is: C8H18...

Homework Statement A square box contain He at 25C. If the atoms collide with wall perpendicularly (90 degrees) at rate of 4.0E22 times/s, calculate pressure and force exerted on wall given area of wall 100cm^2 and speed of atoms =600 m/s Homework Equations PV=Nmv^2 The Attempt at a...

Homework Statement Thermal Dynamics question, gases? So I have this box with lengths 20cm on each side. There are 100 balls inside of it with diameter 5mm each. The density in the box is 7.8 g/cm3. The bottom of the box vibrates so the balls bounce around. The top of the box has a movable...

Two ideal gases are mixed in the box of infinite height placed in constant gravitational field. There are n_1 moles of the first gase and n_2 moles of the second. Their molar mases are M_1 and M_2 respectively. Let's assume that the temperature is constant. What's the molar concentration as...

Please can someone give me a solution of this problem? One liter N2 at 2.1 bar and two liters of Ar at 3.4 bar are mixed in a 4L flask to form an ideal gas mixture. calculate the value of the final pressure of the mixture if the initial and final temperature of the gases are respectively 304...

In the kinetic theory of Gases , we rely purely on classical mechanics. We derive the equations using classical mechanics, and they turn out to be fairly accurate at ideal gas approximation condition of low pressure and high temperature. Now my question is, since in the kinetic theory , we...

What is the difference between a gas and a vapour? I remember one of my lecturers saying that there was a slight technical difference, but i don't think he ever did explain it because it was not important for what we were doing. I did a quick google search and one of the results i found was...

Im trying to figure out how to find the dE/dx for a mixture of gases. I can find how to figure it out for an individual molecule knowing dE/dx for each element, but can't find how to find it for a mixture of two molecules of gases knowing dE/dx for each gas. Is there anywhere I can find the...

Hey guys, Got this question for a small essay: "Explain how observations of electron impact ionization scattering from inert gas atoms provide information on the interaction potential, the electron momentum distributions of the electronic shells of the atom and the angular momentum of the...

Does anyone know figures for Diffusivity (diffusion coefficients) for two gases at different temperatures. Such as air - Hydrogen or air-methane. For example the diffusivity of hydrogen into air when the hydrogen is at 300C and the air at 100C. Please don't point me to Fick's laws...

Homework Statement Consider 2 fermionic gases, each made of 10^6 atoms occupying 10^-3 m^3 volume: tritium, the nucleus containing one proton and two neutrons, and potassium, 19 protons and 21 neutrons. Which gas do you have to cool more in order for a Fermi surface to form? Find the ratio...

Homework Statement Superman leaps in front of Lois Lane to save her from a volley of bullets. In a 1-minute interval, and automatic weapon fires 150 bullets, each of mass 8.0g, at 400 m/s. The bullets strike his mighty chest, which has an area of 0.75 m2. Find the average force exerted on...

Is there any kind of semipermeable membrane which would diffuse gas but wouldn't let liquid to pass. If yes what would that be? Thanks, Vladimir.

a container with a volume of 61cm3 is filled with gas F2 at a pressure of 250mmHg and a temp of -85 C. a small amount of solid P4 is put into the container and a reaction occurs according to P4(s) + 6F2(g)--> 4PF3(g) the container is again cooled to -85 C and the pressure is now measured...

My question is: Simple kinetic model for solids, liquids and gases. I searched on google and find these result but I don't know whether it was right. And also I think it is too long to do in an exam. :smile:. Please help me to check it. Thank you. Model for liquid This is the link for the...

I remember reading before that hydrogen gas is "transparent" to gamma rays. What does this mean? I know it has something to do with the gamma rays not heating the hydrogen. Also, would Xenon gas be transparent to gamma rays?

How do you combine two separate volumes of an ideal gas which are at different temperatures pressures and volumes and then work out the change in internal energy? I have been trying to get my head around this without success.

http://webusers.ct.astro.it/gca/papers/telluric.pdf Would it be possible to use telluric lines to give accurate measurements of atmospheric gases along with synchronous Earth temperature measurements, thus giving an index for gas abundance and variation of heat transfer through same gases...

A child's helium-filled balloon escapes at sea level and 20.0°C. It reaches an altitude of 3330 m, where the temperature is 5.0°C and the pressure only 0.65 atm. What is the ratio of its volume at this altitude to its volume at sea level? PV/T=PV/T i got .94

Homework Statement What volume of CH4 at 0°C and 1.00 atm contains the same number of molecules as 0.58 L of N2 measured at 35.0 °C and 1.50 atm? Homework Equations I think you just need to use Avogadro's Number and multiply by the molar mass? I guess my question is what equation would...

Homework Statement Even at low density, real gases don't quite obey the ideal gas law. A systematic way to account for deviations from ideal behavior is the virial expansion, PV=nRT(1+B(T)/(V/n) + C(T)/(V/n)^2+...) where functions B(T), C(T) and so on are called the virial...

There are two compartments, each has half volume of the total volume, separated by an insulating partition. The whole setup is adiabatic. n mole of a monatomic gas with temperature T1 and pressure P in the left while in the right m mole of monatomic gas with termparture T2 and pressure P there...

Hello, my tutor told me the answer to this questions went beyond the scope of the course. We are taught that according to Le Chatelier principle, a system at equilibrium compensates a changement of pressure by shifting towards products or reactants and thus changing the number of molecules...

I want to calculate the reaction heat in a ammonia convertor but I need some specific heats of N2,NH3,Ar and CH4 at 500°C and 200bar. I could find data at 500°C but not at that pressure. thanks Stefaan

I got one question for you. In the book that I learn from (Physics textbook), I read that "at very small dimensions of the particles (like the molecules of the gases) the force of the light pressuring at small particles can reach the force of gravity which acts on the particles upon." If the...

In high school I've been told that the molecules of gases have generally speed of severals kilometers per second. Hence why the wind is not always present, and why not that fast? (I guess it has to see with the huge number of particles... I never studied such a system in Physics yet, I...

Hi I'm trying to find a value for the density of the exhaust gases emitted from a Honda CBR600 motorcycle engine with not much luck. I only need an approximate value so the density from a similar engine would suffice... Can anyone help?

Hi, my question is this. Is a gas with a positive intermolecular potential like a gravity potential in a pendulum? By this I mean if you compress and the expand the gas the force goes from max potential to a minimum ,creating molecular acceleration in the process and then reverses the...

Homework Statement There's a thermally insulated container with a removable wall. So there are two compartments inside, one with volume V (i call it left box) and the other with volume V + B (right box) so the total volume is 2V + B. Both boxes have N molecules of an ideal gas and are in...

Homework Statement In the first 2 parts of the problem, I calculated at what temperatures the rms speeds vrms of H2 molecules and O2 molecules would equal the escape speed of Earth (11200 m/s). The answers I calculated for this were 10000 K for H2 and 160000 K for O2. Those answers are...

p=momentum=(mass*volume) delta px = pf - pi mvf - mvi mvx - (-mvx) <<<<---- where does this second negative come from ? what am i missing here? 2mvx in my book it shows that delta px = - mvx - (mvx) = -2mvx

Homework Statement Why is the volume of an ideal gas not important? I'm just asking this for my own studying benefit, it's not technically "homework", although we are studying it. My book says that we can draw the fact that the volume of an ideal gas is not important from the fact that...

I just wonder how necessary gases are for pharmaceutical production. If anyone around has been involved in the process, please inform me some special most used gases. THANK YOU

Hi, Can anyone give me any information on where i could find information on the emissivity of a gas, particulally argon, or how i can calculate it? i am trying to create a graph of heat transfer against temperature and see which plays a larger role at particular temperatures when transfering...

I tried this problem a lot of times, but just didnt get the answer. The molecular mass of helium is 4 g/mol, the Boltzmann’s constant is 1.38066 × 10−23 J/K, the universal gas constant is 8.31451 J/K · mol, and Avogadro’s number is 6.02214 × 1023 1/mol. Given: 1 atm = 101300 Pa. How...

if i was to heat a gas [any gas] by 10 degrees celcius, using the smallest amount of heat energy, would i be better off heating the gas at constant pressure or constant volume. i think constant pressure, however i don't know how to justify my answer...:confused: cheers

My question: For gaseous mixture say gas A, B, and C: I knew that X or the mole fraction is equivalent to volumetric fraction, when those gases have pressure and temperature the same with the mixture, and for dalton's law, the summation of the pressure of gases is equivalent to that of the...

Hello everyone, I'm trying to understand quantized vortices in rotating Bose gases. From what I understand, any system that is described by a quantum mechanical wavefunction [tex] \psi [\tex] will be irrotational (in other words, will only be able to get angular momentum through the...

Hi Suppose there are two cylinders / vessels. In one cylinder the pressure is 1.5 bar & in other 0.5 bar.If both cylinder are connected internally through valve connection, what will be the final pressure in both? explain

Homework Statement Temperature of a gas (in kelvin) is proportional to the average kinetic temperature of its particles. Question: The temperature of 55k (277C) to 1100k(827C). At 277C the mean kinetic energy of the gas is 1.14x10^20. What is it at 827C?Homework Equations kinetic energy= ½ x...

Homework Statement A mass of gas occupies a volume of 4.3L at a pressure of 1.2 atm and a temperature of 310K. It is compressed adiabatically to a volume of 0.76L.Determine (a)the final pressure and (b) the final temperature,assuming the gas to be an ideal gas for which gamma = 1.4...

which gas would diffuse the quickest? the slowest? A. methane B. oxygen C. nitrogen D. C2H6 (need to show work to verify!)

I had a question on how to find the stoichimoteric coefficient in combustion reaction contains several types of natural gas. Lets say for example: u start with a natural gas (using moral analysis) 0.865CO2 + a0.08C3H8 + b0.02C3H8 c0.035N2 + d(O2 + 3.76) ------> eCO2 + fH20 + gN2; Using...

[SOLVED] why are noble gases, gases? Homework Statement this has bothered me for some time, what determines the density of an element at normal atmoshpheric conditions? and more importantly what determines if a substance at s.t.p is a gas solid or liquid Homework Equations gas...

Homework Statement why do the noble gases stay at a gas state whe almost every other element in the period doesnt? The Attempt at a Solution because the elctrons repel each other? i don't know

Creating "Visible" Inert Gases Please understand this this question is coming from a completely ignorant user who is just starting his research into an area he knows absolutely nothing about. Given that, my question(s) may make no sense at all to an educated set of people. Thank you. Is...

Avogadro's Law states that the same volume of two different gases (at the same temperature and pressure) contains the same number of particles. I understand that this hypothesis was first suggested after Gay-Lussac's experiments with electrolysis showed that the volumes of hydrogen and oxygen...