Gases Definition and 501 Threads

Homework Statement An ideal monoatomic gas is characterized by the two equations PV=NRT and U=\frac{3NRT}{2} in which R is a constant. Find the fundamental equation corresponding to a monoatomic ideal gas. Homework Equations S=\left ( \frac{1}{T} \right ) U+\left ( \frac{P}{T} \right )...

If we have a "quasi-rigid" rotating convective cell where the gas overall rotates at the same angular velocity, we could establish a non-inertial frame of reference co-rotating with this convective cell such that the particles of the gas (seen from that frame of reference) may follow a...

I'd expect that since they carry more kinetic energy, they are more fluid. Thanks!

Homework Statement Two particular systems separated by a diathermic wall have the following equations of state: \frac{1}{T^{(1)}}=\frac{3}{2}R \frac{N^{(1)}}{U^{(1)}} \frac{1}{T^{(2)}}=\frac{5}{2}R \frac{N^{(1)}}{U^{(2)}} where R=1.986 cal/mol K, N^{(1)}=2 and N^{(1)}=3. Homework...

Homework Statement When 1.000 mol PCl5 is intorduced into a 5.000L container @500K, 78.50% of PCl5 dissociates to give equilibrium mixture PCl5, PCl3, Cl2 : PCl5--->PCl3+Cl2 (this eq. is reversible) (a) calculate Kc and Kp (b) if the initial concentrations are [PCl5]=.500M...

Homework Statement I was going through my past question and answer, I then came across this: "The noble gases have the highest ionization energies in each period". I then wondered why and how the above statement is a reality. How can the above statement be true when the noble gases have...

Hi, I am now learning about climate change and have come across resonance. When I previously studied SHM however, I learned about resonance, and I believe I have a good understand of what it means. If the frequency of a driving force matches the natural frequency of the system, this leads to...

Homework Statement Hey guys, I am having trouble understanding how the ideal gases behave and I got these 3 questions in homework: If an ideal gas is transferred, at constant temperature, 10 Joules of heat, does the internal energy change? If an ideal gas is transferred, at constant...

50 minutes into this video the professor puts a balloon into liquid nitrogen that's about 1/4 of the room temperature, but its volume decreases to much less than 1/4 of its original volume. Why? Right after the balloon demo, he talks about tennis balls. Why if you open up a can of tennis...

Homework Statement I want to start by saying that my instructor is a particle physics guy. He loves to talk about particles seems to want to rush through fluids and thermo so he can get to particles and the 'real modern physics.' He is skipping, skimming and not really covering a lot of this...

For a non-ideal gas expanding in a vacuum, the kinetic energy of each of the molecules does NOT remain consant as the gravitational effect of the other molecules would "slow down" these velocities by deceleration. What are those forces referred to? Are they "Newton" forces or what? I can't...

Homework Statement See attachment ecxample001. Homework Equations See attachment D11. The Attempt at a Solution In the first equation (Cp/R = a+bT+cT^2...etc.), Cp/R is the constant pressure specific heat. The general formula for enthalpy change is h2-h1 = integral[Cp]dT, so does...

hi.. please tell me that 1) why some materials like ZnO, SnO, Pt, etc r sensitive to gases and others like Si, Ge, InP, GaAs, etc r not sensitive to gases. 2) how doping increase the sensitivity of a certain material to certain gases.

How the current Flows from gases ?

Hello,world 1-"the intermolecular attractive forces between gas particles are very weak due to the large intermolecular distances separating them" Is that true? this is wriiten in my textbook and it is confusing me because I've always thought of it in a different way ,I thought the...

I have reviewed recently the demonstration of the formula for the pressure of a gas by using the kinetic theory and it seems that there is a terrible flaw in it, which I will describe below. Can anyone comment on it, please? In all textbooks, the pressure of a gas is proven to be proportional...

Homework Statement 2.0g of helium at an initial temperature of 300K interacts thermally with 8.0g of oxygen at an initial temperature of 600K . What is the initial thermal energy of each gas? What is the final thermal energy of each gas? How much heat energy is transferred, and in...

Hi, I have a conceptual and mathematical question about gases in stars. The information we have from stars is due to the motion of particles in one dimension: along our line of sight. We assume that this motion is isotropic and that regardless of where on the star we look, we'll get the...

Hi, I have a conceptual and mathematical question about gases in stars. The information we have from stars is due to the motion of particles in one dimension: along our line of sight. We assume that this motion is isotropic and that regardless of where on the star we look, we'll get the...

On the way into work, I pass through "Hospital Alley". I saw a collection of Praxair tanks with radiating fins that were covered in ice. If you put fins on something that's cold, it will warm up faster. I was trying to figure out why they would have a system that was designed to warm up the...

A rigid tank with a volume of 0.75 m3 initially contains air at 70 kPa and 25 degrees C. A small hole develops in the tank. The surrounding air at 100 kPa and 25 degrees C slowly leaks into the tank due to the hole. Heat transfer between the surroundings and the tank maintains a constant air...

Hello, So, I am reading this theory, and I come across this sentence explaining to me that gas particles of different mass have the same average kinetic energy at a particular temperature. Is this somehow due to momentum? Each particle is given a certain energy which will cause them to move...

Hi. Consider a plenum with a small restricting outlet. Highly heated gas constantly flows through the plenum, and a build-up, or congestion of high-pressure gas exists in the plenum due to the restricting outlet pipe. The intake flow of gas does not change. 1. A hotter plenum should...

Okay, I have searched the internet for why one mole of any gas occupies the same volume, and found the internet devoid of any explanation that will suffice in my understanding. Can someone please help me Thank you

hi everyone, consider two different masses of ideal gases with different molar masses, we're putting them in a uniform gravitational field and wait until they come to their equilibrium states. how would the density distribution change with height in this case? ( i came out with this question...

Hello all, I'm modeling a situation in which a gas moves through a pressure gradient established by a quartz frit with 40-100 μm sized pores. What I'm interested in finding out is how the mean free path of the gas changes after it exits the frit region, if at all. I think that the mean...

Hi! I'm working on problem, where I have to estimate energy, lost due to flue gases, i.e. some amount of natural gases burned in some time period, say [t0;t1]. Burning is used for some material heating. I need to find energy, lost by gases (gases, after combustion), which goes out from flue...

Homework Statement I know how to do the problem so I don't need help actually solving it, I just don't understand the concepts. A sample of 4.5g of methane occupies 12.7L at 310k. a) Calculate the work done when the gas expands isothermally against a constant external pressure of 7.7 kPa...

Hello everyone. I would like to know if I did this correctly. Homework Statement Calculate the heat, internal energy and work of 1 mol of hydrogen, which undergoes a reversible adiabatic expansion from a volume of 5.25 m^3 at 300 K to a volume of 25.5 m^3 The Attempt at a Solution...

Homework Statement I attached the problems. The first one is D) at the top of the page parts a) and b). The second one is E) at the top of the second attachment. 1) The rigid tanks shown below have volumes of .4m^3 and .004^3 respectively and each contains a water liquid-vapor mixture of...

The main book we'll be using will be Serway's, but I want a different book that's more focused on the mathematics formulation of thermodynamics and kinetic theory of gases, and not so simple as Serway's. The other 3 books in the discipline's bibliography are: • M.W. Zemansky and R. H...

Calculate "a" values given equation of state for gases Homework Statement For my equation of state: Vm = (RT/P) - (a/T) what kind of sign for the constant a (positive or negative) do you think the following gases will have and why: a. H2 b. He c. CH4 d. CO2 Hint: There is almost no...

Homework Statement Two monatomic ideal gases are separated in a container by an impermeable wall, with volumes V_{1} and V_{2}, temperatures T_{1} and T_{2}, number of atoms N_{1} and N_{2}, and both are at the same, constant pressure P. The wall is then removed, and the pressure is continued...

I think most of us have probably seen the little trick in which somone will place a burning candle in a bottle and get something like an egg to be pushed inside the bottle. How does this happen? I understand that a vacuum is created inside the bottle, and the normal outside air...

Homework Statement From the book: "When electrodes are placed in a gas at normal atmospheric pressure no current passes and the gas act as an insulator until the electric field is increased to above 3 or 4 MV/m when sparking takes place. In crontast, at lower pressures, a steady current can be...

I've never known this but the equation only seems to contain a conduction term so I assume it can only apply to solids. Is there a similar equation for the time-evolution of temperature fields in gases, where convection is also considered? (how about radiation? although that sounds like it will...

Hi I would like to ask is there any relation between compressibility factor of gases and temperature? My textbook says that it always increases with increase in temperature but doesn't explains how? I know that on increases the temperature it is harder for molecules to show attractive...

Hi guys, I am designing a mixing box for different gases. Here is my plan: I will use Acrylic panels with the dimension of 30cm x 30cm x30cm. Two 3/4 inch pipes feed inflows at flow rate of 1300 LPM in total. The outlet is an rectangular opening of 8cm x 8cm. How can I define the pressure inside...

If the aleatory speed of a gas rises with pressure and temperature and there is not an apparent limit for these two, what prevents the particles to reach the speed of light? thank you

I'm going to be very careful to avoid the word "greenhouse" because of the indefinite ban on discussions about climate change - I want to be clear, this isn't a topic about that. Part 1 - some gasses in the atmosphere absorb and emit radiation in the thermal infrared range. Gases like water...

i have a question that I cannot solve; Show that the rms velocity of a sodium atom moving in a vacuum chamber at 300 kelvin is about 570 metres per second pV=nRT and 3pV=Nm<c^2>

Homework Statement One mole of an ideal gas does 1975 J of work on the surroundings as it expands isothermally to a final pressure of 1.2 atm and a volume of 24 L. find the initial volume. The universal gas constant is 8.31451 J/K mol The Attempt at a Solution Something he...

in the picture you can see Three different tanks contain Three different gases. the temperature are equal to 25 Degrees Celsius in all the Three tanks, and it not changing. i asked to calculate the kinetic energy of the Three different gases. so i thought to use this formula:3/2*RT but i...

final pressure when two gases at different pressure are mixed. The valve between a 5-L tank containing a gas (Methane) at 3 atm and a 1-L tank containing a gas ( Ethane) at 0.55 atm (both are in 50 Degrees Celsius) is opened. What is the final pressure in the tanks? (assume that there is no...

I just have a question of this subject, it is a pretty straight forward concept, however there are things that i just can;t figure out, like in any given gas which is the minimum volume required to have a maxwell boltzman distribution, @ 1 atm 273.15 K ? I honestly just can't figure it out...

Homework Statement A furnace is fired with 1000 feet cubed per hour at 60 degrees F and 1 atm of a natural gas containing the following volumetric analysis: CH4: 80%, C2H6: 16%, O2: 2%, CO2: 1%, and N2: 1%. The exit flue gas temperature is 800 degrees F and the pressure is 760 mm Hg absolute...

As a hobby, I have been researching the different aspects of modeling the sounds produced by musical instruments. Particularly, I want to create as accurate a model as possible, and not something very simple (to which many may ask "why?" if complexity will reduce the likeliness of real time...

Two gases are in a vessel and separated by a partition. They start at different pressures P1 and P2. When the partition is removed and equilibrium restored am I right in thinking the new pressure is the average of the starting pressure i.e. P_{f} = \frac{P1+P2}{2} Thanks.

Hello Forum, Does anyone know where I can find the slater bases for the alkali metal 'np' orbitals and the noble gas '(n+1)p' orbitals, either altogether or individually? I'm a physicist and wanted to know what the standard (or even non-standard) reference is? I know that the...

Homework Statement A volume of 2.40x10^-3 m^3 of hydrogen gas is enclosed in a cylinder with a movable piston at 300 K under a pressure of 203 kPa (2.00 atm). The density of hydrogen under these conditions is 0.180 kg m^3. 1. The gas is cooled down to 150 K, and the pressure is increased to...