Gases Definition and 476 Threads

Hi, Do IDEAL gases absorb heat when they expand? I asked a few people this question, half said yes and half said no. Im after a simple yes or no answer with a small explanation to clarify this one. If anyone knows, please reply. Cheers! :smile:

Quicklime is used to dry gases.It is also basic in nature. It cannot be used to dry acidic gases such as sulphur dioxide and carbon dioxide. Why is this so? Is it because alkali (quicklime) will react with the acidic gases to form salt and water? Please help. Thanks. :smile:

Homework Statement 1) A container is filled with a mixture of nitrogen and oxygen. What is the ratio of the rms speed of oxygen molecules to that of a notrigen molecules? (molar mass of oxygen = 32 g/mol; molar mass of nitrogen = 28 g/mol) 2) By what factor does the rms speed of neon...

Homework Statement A syringe of volume 20 ml has just been used and now lies empty on the doctor's desk. The pressure in the office is 100,000 Pa. Assume that the air is an ideal gas consisting of nitrogen N2 (80%) and oxygen O2 (20%) molecules. k=1.38×10-23 J/K and the molar mass of oxygen is...

I want to ask if I have 2 cylinder container 1) 50 m3 2) 60 m3 If I inject the same no. of mole of gases into these containers respectively when I apply PV=nRT Is the volume in calculating the gases in these containers are the same??

Homework Statement Two moles of an ideal gas expand to double the initial volume at a constant temperature of 400 K. Calculate the work done by the process. Homework Equations W=2.303nRTlog(v2/v1) The Attempt at a Solution i tried the formula and got 4613.959 J but the answer is 554.6 J

I'm trying to show a formula for an ideal gas, but I don't get the right results. Homework Statement For an ideal gas PV = nRT where n is the number of momles. Show that the heat transferred in an infinitesimal quasistatic process of an ideal gas can be written as dQ = \frac{C_V}{nR}VdP...

The noble gases when electrically stimulated emit different visible wavelengths. Can they be combined for a greater variety of coloration?

The Earth's atmosphere is lacking in gases like hydrogen and helium because at a given temperature, a 'significant fraction' of hydrogen or helium particles have speeds greater than Earth's escape speed, while gases like oxygen only have a 'negligible fraction' of the total number of particles...

Homework Statement Two 800 cm^3 containers hold identical amounts of a monatomic gas at 20 C. Container A is rigid. Container B has a 100 cm^2 piston with a mass of 10 kg that can slide up and down vertically without friction. Both containers are placed on identical heaters and heated for...

I have a simple question. If we increase the pressure of a gas by decreasing its volume without heat exchange, does the temperature always change? Or does it depend how fast we change the pressure? I tried to find the answer for this question, unfortunately I couldn’t. Thanks for any help!

Homework Statement An expandable cylinder has its top connected to a spring with force constant 2.00 103 N/m. (See Fig. P10.58.) The cylinder is filled with 4.00 L of gas with the spring relaxed at a pressure of 1.00 atm and a temperature of 20.0°C. (a) If the lid has a...

The problem I'm working on is verbatim as follows: "A sealed cubical container 20.0 cm on a side contains three times Avogadro's number of molecules at a temperature of 20.0 degrees Celsius. Find the force exerted by the gas on one of the walls of the container." So, I would assume that I need...

Hi, I have been struggling a little with this question. Scuba divers breathe a mixture of O2(g) and He(g) to avoid "the bends, a condition caused by nitrogen in the blood. If 65.0g O2(g) and 2.00g He(g) are placed in a 5.0L tank at 25oC, calculate: If the average human takes 15 breaths...

Urgent Help Needed! (gases) I need some urgent help with figuring out how to find the distance which 2 gases will meet in this question.. Given: Samples of HBr gas and NH_3 gas are placed at opposite ends of a 1.80 m tube. Question: If the two gases are allowed to diffuse through the tube...

For the random walk approach to gases, liquids, or solids, why isn't there a gradient? The atoms don't jump by themselves, right? They should have to feel forces to jump...

That came out in my qualifying exam. The question was if a gas with rotational and vibrational energies enhanced, does obey the Ideal Gas Equation PV=NKT. You can answer with all the tools you have at hand. My comitee member didn't agree with me, but anyway I persisted in my answer and I...

A cylinder containing a gas is lifted from the first floor to the second floor .What is the amount of work done on the gas ? What is the amount of work done by the gas ? Is the internal energy of the gas increased ? Is the temperature of the gas increased ? consider 2 cases : case 1 : the...

Hello, I work on a project on the recovery of gases HCl 33 % which escape during the load of this last one in tanks. I want to know if you can help me or propose me a solution for the calculation of this quantity and if you have an idea of a method to get back them. or any information about the...

Hello, I work on a project on the recovery of gases HCl 33 % which escape during the load of this last one in tanks. I want to know if you can help me or propose me a solution for the calculation of this quantity of gas and if you have an idea of a method to get back them. or any information...

Apologies if it's been asked before, but this came up on another thread. The Kinetic Theory of Gases says that hydrogen molecules at room temperature and pressure are traveling at circa 4000mph. So if I were to suddenly decap a canister of hydrogen in a vacuum chamber, I should see molecules...

heres a question-(tough one)..i jus wunna check my answer.. a small sample of magnesium was placed into a reaction flask as shown. HCL acid was added and the hydrogen gas generated wus bubbled through water into a gas collection tube.when the reaction reached completion, the gas collection...

Is there a unit to measure the compressability of a gas? What gases are the hardest to compress? The easiest? Any links to a better understanding?

Hey. Im doing this question where Air (said to be ideal gas) is compressed from a pressure of 0.1 MPa and Temp 300K to pressure .5 MPa and temperature 480K. We are supposed to determine whether the process is possible to do adiabatically (sorry if that is the wrong spelling). I hadnt done...

Sir, Is it true that the average kinetic energy of all gases are the same at the same temperature? For example at the same temperature the molecules of hydrogen, oxygen,etc. have the same energy irrespective of their different atomic weights.

We know the Maxwell-Boltzmann distribution for the energy and the speed of a molecule of an ideal gas. Using derivatives it is easy to see that the most probable speed for a gas molecule is given by sqrt(2kT/m), which corresponds to kinetic energy kT. Calculating the most probable energy, we get...

Is it possible to imitate the repulsion of atoms of gas on macro-scale? (I mean: atoms of gases repell all other atoms around it using some force. Among them there is nothing (vacuum) - isn't it. Well... - imagine if you could make a macro-object that could repell all matter (atoms) (a sort...

Sir, Why is the gaseous state called the state of greatest potential energy?

Sir, Please help me with this problem. # A fixed mass of gas at constant pressure occupies a volume V. The gas undergoes a rise in temperature so that the root mean squared velocity(c) of the molecule is doubled. What is the new volume? I solved it in the following way:- Let V1 be the...

Hi. I am working on an assignment involving common gases (oxygen, nitrogen, ammonia etc.). I've done it all, except for the 'Industrial preparation' of the gases. What is industrial preparation? i know what laboratory preparation is, but not industrial. Thanks, Dan.

4)Sir, Please give a hint to solve the following problem. # In order to double the separation between the molecules (keeping the temperature fixed), how many times the initial pressure should the final pressure be made? How do you relate intermolecular distance and pressure?

Hi I wanted to know : - Most gases increase in temperature when they are compressed . Where does the energy for this come from . When a change of state from liquid to gases occurs is it accompanied by change in the internal energy of the liquid molecules ? Thanks a lot ..

3)Sir, Please help me with this problem. # If one mole of a mono atomic gas(r = 5/3) is mixed with one mole of a diatomic gas(r = 7/3),then what is the value of the r for the mixture? In the above problem r = C(p)/C(v) = ratio of specific heats.

1) According to Boyle’s law, PV = C (At constant temperature) Where C is the constant of proportionality. Is it true that the magnitude of C depends upon the quantity of gas enclosed?

take a balloon filled with helium if you where to make the balloon rigid, without changing its weight, then suck half of the helium out of it. would the balloon, with the same volume but different density, have more lifting power?

Why do gases absorb neutrons less readily than water? Any ideas on the above question? Leila

i'm given that p= \frac{1}{3}\rho\overline{c^2} without calculation, what happens to rms speed if pressure halved, temperature constant? firstly, just from rearranging the original equation, you get \overline{c^2} = \frac{3p}{\rho} square rooting both sides to get rms speed gives...

Can I use molar ratios for gasses, solids, and aqueous solutions all in one equation? For instance: Mg(s) + 2 HCL(aq) -> MgCl2(aq) + H2(g) Can I say that if i had 2 moles of Mg I would have 2 moles of H2. Does this trick have anything to do with Amedeo Avogadro?

as promised: a cylinder of volume 2x10^-3 m^3 contains a gas at a pressure of 1.50MNm^-2 and at a temperature of 300K. calculate number of moles. i think I'm ok with this bit: n=(pV)/(RT) =(1.5x10^6)x(2x10^-3) all divided by 8.31x300 gives 1.2033694... calculate number of molecules...

ideal gases. what fun. please help! i'm having problems getting sensible answers... 1. a cylinder contains 4.62g of hydrogen at 17C and 2.32 x10^6 Pa calculate number of moles. actual mass/molecular mass= 4.62/2= 2.31 (relative molecular mass given as 2 in the question...is this...

1) Find the molar mass of an unknown substance if 227.5 mL of an aqueous solution containing 2.785 grams of the unknown generates an osmotic pressure of 588.0 mm Hg at 20.9 Celsius. Report your answer to 3 significant figures. pi = MRT pi = 588.0 mm Hg = 588 mm Hg/760 mm Hg = 0.7736842...

I have found the following question on a previous exam paper whilst I've been doing my revision, and have a few questions about how to set up my answer. Question: Calculate the entropy change of 3 moles of an ideal gas when they are isothermally compressed (T = 30° C) from a volume 5V to a...

Kinetic Theory of Gases... Little help please :) Hey, i didnt seem to have trouble with any other questions except this one... all i could figure out is that i somehow must use the kinetic theory of gases? A massless cylinder 34 cm long rests on a horizontal frictionless table. The cylinder is...

Hi Everyone, I just have a quick question about pressure and kinetic energy of gases. Say you have 3 identical flasks filled with 3 different gases, Flask A contains CO at 760 torr Flask B contains N2 at 250 torr and Flask C contains H2 at 100torr and all three flasks are at a temperature of...

Which of the following gases has the lowest average speed at 25C? a.NH3 b.O2 c.H2S d.CH4 Is it H2S? Given the formula sqrt(3RT/M), is it not true that the gas with the greatest molar mass will have the lowest speed? NH3 = 17.03 g/mol O2 = 32 g/mol H2S = 34.08 g/mol CH4 =...

1) In an open end manometer, one end of a U-tube filled with mercury is attached to a gas-filled container and the other end is open to the atmosphere. If the gas pressure in the container is less than atmospheric pressure a.Hg will be forced out of the open end of the U-tube...

Do anyone know anything on the green house gases? How are they causing global warming?

Two gas cylinders are identical. One contains the monatomic gas argon (Ar), and the other contains an equal mass of the monatomic gas radon (Rn). The pressures in the cylinders are the same, but the temperatures are different. Determine the ratio KEAvg,radon / KEAvg,argon of the average kinetic...

I'm having problems trying to figure out the most probable speed of a gas with the only givens being what gas it is and the temperature of the gas, for example, find the most probable speed of Ar at 127C. The equation is Ke = 1/2mv^2. I know how to get the average kinetic energy, speed, and...

how does the speed of sound vary with temperature in an ideal gas? how do we derive this relation?