Gases Definition and 501 Threads

Homework Statement 1.00mole of nitrogen (N2) gas and 1.00mole of argon (Ar) gas are in separate, equal-sized, insulated containers at the same temperature. The containers are then connected and the gases (assumed ideal) allowed to mix. A) What is the change in entropy of the system? B) What is...

I'm interested in predicting the index of refraction of atmospheric air and several nonpolar gases at room temperature for pressures of 1 atm - 0 atm. I'm not really sure where to get started. I have found the relation n=\sqrt{1+\frac{3AP}{RT}} but I don't really get where it comes from. Well...

Hi, this is my first post on here. My question relates to adiabatic cooling/heating of a gas. I am trying to grasp the idea conceptually rather than being able to explain it mathematically per se... When gas escapes rapidly from a pressurised cylinder the rapid expansion of the gas is...

Hi, The permanent gases like Nitrogen, Helium etc. have more specific heat capacity as liquid than their gases. Seemingly degree of freedom should reduce in liquid form, and therefore, specific heat capacity must reduce in liquid form. But this isn't the case. I remember reading somewhere...

Homework Statement A closed, insulated cylinder is divided into two equal parts by a piston. One compartment contains Nitrogen at T=300K, P1=5bar, the other Carbon Dioxide at T=300K, P2=20bar. The cylinder contents then reach mechanical and thermal equilibrium. 1. Assuming that the gases...

Is it possible to manipulate a noble gas to produce any line in its emission spectrum for a ? For example, argon produces blue but it also has several lines of red, can one force the argon to emit the red bands?

Well i need to separate NO2 from cars exhaust to then produce nitric acid and the use it in other reaction. The problem is that i have other byproducts such as SO3 and many more, so i can't make nitric acid without producing other acids. What i was thinking is. Since NO2 have a very high boling...

Homework Statement Given a house(with ventilation system) contains 50m3 of gases, what is minimum rate should I pump gases into the box so that the box contains completely new gas from outside in an hour? (Challenge question) Homework Equations rate = volume/time statistical mechanics fluid...

When two gases are mixed, if they are to be in thermal equilibrium, they must have the same average molecular speed. Why or why not?

Why is CO2 released when soda is shaked, and dissolves again when the soda is stable? My teacher in class today said that soluble gases will dissolve faster in the presence of agitation. In practice (e.g. shaking a bottle of soda), this seems to not be the case. Please explain Thank You, EJ

Homework Statement On a planet not entirely unlike earth, the ratio of the partial pressure of N2 to that of O2 equals 1 at an altitude of 1 km: \frac{p_{\text{N}_2}}{p_{\text{O}_2}} = 1. Assuming that T = 200 K, and the gravitational constant is 5 m/s2, what is the ratio...

Homework Statement A cylinder containing 19 kg of compressed air at a pressure 9.5 times that of the atmosphere is kept in a store at 7 degrees Celsius. When it is moved to a workshop where the temperature is 27 degrees Celsius a safety valve on the cylinder operates, releasing some of the...

Hi Everyone, I am trying to understand how a certain flow conversion factor was reached. The factor is used to convert Oxygen to Air and vice versa. The source of this conversion factor states: "The theoretical ratio of Air flow to Oxygen flow is as follows: (Flow (Air))/(Flow (O_2 )...

Hi guys. Consider the problem of calculating the multiplicity (phase space volume) of N hard sphere gases each of whose center of mass is confined to a volume V. The spheres themselves have volume ##\omega## and do not interact with one another in equilibrium time scales. Then ##\Omega \propto...

Homework Statement How many milliliters of Cl2 gas, measured at 28.0 °C and 750 torr, are needed to react with 18.5 mL of 0.173 M NaI if the I- is oxidized to IO3- and the Cl2 is reduced to Cl-? Homework Equations The Attempt at a Solution So the molar mass is .0030906 mol NaI...

Hi, first time poster. Here's the scenario. In a given vessel containing a given amount of water at a given temp, gases from the air will reach equilibrium with those dissolved in the water contained in the vessel. Now suppose live plants are added to the water. During the day, photosynthesis...

Is it that ideal gases do not possesses potential energy because there are no intermolecular forces. But, real gases do have potential energy and its potential energy is the highest among the different phases. ( Potential Energy of Gas>Liquid>Solid ). I need someone to make these things clear to...

Homework Statement A mixture of two gases, A and B, exists at pressure p1, volume V, and temperature T1. Gas A is subsequently removed from the mixture in a constant-volume process. The remaining gas B is found to have a pressure p2, volume V, and temperature T2. Express the ratio of the...

Hi, I understand that vapor pressure is independent of initial pressure, and depends only on temperature. However, is this true of a non ideal gas at high pressures? (I am specifically interested in the vapor pressure of a meg/water mixture at approx. 100 bar), Thanks

Greetings to all in this fine community, If you are familiar with Crane Tech Paper 410, there's an equation to calculate gas flow rate in SCFH. It takes into account pipe losses, pipe diameter, and inlet and outlet pressures. q'h = 40,700*Y*(d^2)*((DP*P'1)/(K*T1*Sg))^0.5 q'h = SCFH d = pipe...

Hello 1. I was wondering why internal energy is usually expressed as a function of temperature and specific volume and enthalpy a function of temperature and pressure (ie why is u(T,v) and h(T,p)) and some other set of two properties? 2. For du = \frac{∂u}{∂T}dT + \frac{∂u}{∂v}dv and dh =...

The way I understand plasma is that is almost a gas except some of the electrons of separated from the nuclei entirely making positively charged. Is there a temperature in which Iron is by definition a gas, and not a plasma? Also, can something like a noble gas become a solid?

I am looking for a way to map gases over a city, what are some ways I could do that? This is a theoretical experiment so cost is not an issue. Thanks in advance

Greenhouse gases absorb and then re-emit the heat energy of infrared rays which have been partially absorbed and then reflected off the Earth from the sun, which is how the greenhouse effect works. I have heard, however, that in order for a gas in the atmosphere to be considered a greenhouse gas...

I am not sure how to properly use the scientific notation in this problem. I have attempted to solve it several different ways to no avail. A house has a volume of 1.45 x 10(4)m(3). At 20.0° C and 740 mm Hg, the air fills the house. If the temperature and pressure increase to 35.0°C and...

Hello, I'm looking for some changes of energy states of particles, as two gases are mixing together without total volume changing. That would explain increasing entropy better than their position combination. I know the particle energy states are getting more closely (the band gaps are reducing)...

Homework Statement Nitrous oxide reacts with ozone to form dinitrogen pentoxide. There are four moles of each reactant and the volume of the container in which this reaction takes place is 2 L. T is constant. The equilibrium constant for this reaction is 1. How many moles of product are...

How would I answer the question: explain why even small amounts of CO2 and CH4 can have a large effect on global temperature?

Homework Statement A sealed bottle at 1 atm of pressure holds 1 mole of neon and 1 mole of argon gas at a temperature of 295K. The curves in the Figure (http://phlnx3.pas.rochester.edu/webwork2_files/CAPA_Graphics/Gtype43/prob01a.gif) show the distributions of velocities of the molecules of...

Hi guys, I'm studying the Kinetic Theory of gases from Pauli's book Vol. 3. Here he describes a section on the Mean free path, where the probability of two particles with speed v and v' colliding is described as:What is f(v,v') here? Is it the velocity distribution function? If so, isn't it...

Homework Statement Consider the following statement: "The temperature of a gas is a measure of the speed of its particles (atoms and molecules). Now suppose that I mix two gases together, for example oxygen and carbon dioxide, which are initially at different temperatures; if I wait long...

I was wondering if someone could help me with the current and foreseeable technology to use Earth's energy (nuclear, hydro, etc.) to actually scrub the atmosphere of CO2 and other gases. I'm curious if this is even possible and how it might be done. I've been trolling the internet for this...

why are scientists now more concerned about carbon dioxide as a greenhouse gas rather than methane for example? many thanks,

Hello, Me and two other people are doing a science research competition for high school students and for our project we thought of a machine that takes in air through a pump and dissolves CO2 and only CO2. The problem is I don't know what to put in for a solution or pure liquid that would...

People normally talk of electrons performing oscillatory motion when an electromagnetic field is incident on an atom. But, won't the electric field of the E.M. wave cause the nucleus of the atom to vibrate...? . "Note: Here I am talking of isolated atoms, that is atoms of noble gases, and not...

Does anyone know where I can physics related to the highest pressures that have been achieved for any gas in a lab, and if any new properties of such gases have been seen? There is all kinds of high pressure physics for solids and liquid states of matter, but I can't find anything about high...

A glass bulb contains air at room temperature and at a pressure of 1 atmosphere. It is placed in a chamber filled with helium gas at 1 atmosphere and at a room temperature. A few months later, the experimenter happens to read in a journal article that the particular glass of which the bulb is...

Hello! At work we have an UV aging test chamber that produces around 140 W.m^-2 UVA 15 W.m^-2 UVB and less then 1 W.m^-2 of UVC. The chamber is big, we have to go in and out to collect the items. Is it possible to have ozone formation or other harmful gases inside the chamber?

[b]1. A rigid container is filled with a mixture of three gases: A, B and C. the pressure gauge reads P[T]. The container is evacuated and fill with an amount of gas A equal to that in the original mixture. The gauge now reads P[A]. This process is repeated for gases B and C with the pressure...

This might be a stupid question, but I am confused about the ideal gas theory. I know that we assume high temperatures and low pressures, and that the volume is negligible when we compare it to a container, but my textbook is very confusing about this point. It says assume zero/negligible...

Hi everyone, Is the behavior of gasses, on a quantum level, covered in solid-state physics? If so, where can I start? My knowledge of quantum mechanics is very conceptual, very limited in the mathematical part. But by no means do I completely understand all the concepts, just that most of the...

All the elementary books I had ever read says that gases contains molecules moving randomly in all directions.Atoms/Molecules are much far apart than in solids.Then what fills the space between the atoms/Molecules?Is it a vacuum?

Homework Statement We have a cylindrical container filled with a gas: the container has an upper compartment with 2 moles of this gas, and another compartment below with 1 mole of the same gas, separated by a diathermic boundary, and also has an adiabatic mobile plunger over the upper...

So this is a fairly simple conceptual question: can you estimate/compare the mean free paths for individual components of a mixture of gases? I'm primarily looking at the equation given here and the information accompanying it. Consider the case where we have several individual, separate...

I do not understand how equation(3) occurs.(taken from the book Internal Combustion Engines by John B.Heywood) $$ $$ Consider a reactive mixture of ideal gases. The reactant species M_a,M_b etc.and the product species M_l,M_m etc. are related by the general reaction whose stoichiometry is...

I was thinking of a substance I could use to describe particle arrangement in solid/liquid/gas phases to school kids, and after realising water would be bad to use (since the liquid is denser than solid), I thought of using metal elements since they can exist in all phases. Basically the...

First off, Greetings everyone! I realize this is a pretty broad question, considering these numbers will vary with temperature, pressure and etc. But I was hoping someone could me a average number just so I can get a good idea. I'm trying to find out the amounts of dissolved gases are in...

Why is velocity of sound in gases independent of pressure?

Homework Statement The average kinetic energy of a nitrogen molecule at temperature 25c is _____ . Select the correct answer. 1)5*10^(-21) J 2)3*10^(-20) J 3)1*10^(-20) J 4)9*10^(-20) J 5)8*10^(-21) J (i guess they are all wrong ) Homework Equations KE=3/2 K.TThe Attempt at a Solution...

Hi! I have two questions. First, how do I calculate the pressure of a non-ideal gas if I know volume, temperature and the number of moles? The gas in question is water vapor. I suspect a constant for the specific gas will be involved. Which constant is this? And secondly, how do I...