Gases Definition and 501 Threads

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?

I was reading that helium does not accummulate in the Earth's atmosphere due to the fact (a claim) that it is too light to be retained by gravity and diffuses out into space. Does anyone know the physics that prevent the atmosphere seeking the vacuum at whooshing out into space. Is there a...

hello,i have question to ask here. :smile: 1. which of the following is not correct for an ideal gas? A. the average kinetic energy of the gas increases with temperature B. the force of repulsion between molecules is proportional to the distance between them C. the gas...

Hello My first posting and doubtless it betrays my ignorance :smile: Doing the basic maths for an ideal gas, I find that the speed of a molecule exceeds the speed of sound through the same gas. I know jets make a terrific 'boom' when they break the sound barrier. Why don't gases go boom...

In my physics book, the 4 properties of an ideal gase are 1. nonviscous 2. steady flow (laminar) 3. incompressible 4. irrotational My question is the properties of being irrotional the same as the vector functions that have a Curl=O iff irrotational My physics book states the...

hello :-p i want to ask about the deviation of real gases under low temperature and high pressure. :-p my reference book states that carbon dioxide deviates more than nitrogen and hydrogen,this is because the order of boiling points of is decreasing from carbon dioxide to hydrogen.this...

Suppose you have an ideal gas in a closed container. The gas molecules will be moving at random at very high speeds. Now I've figured out that the probability of a gas molecule for being in the center of the container is higher than the probability of being near the sides. Then should we also...

Hai, I have the following situation: I have a closed container with a certain gas at a certain temperature(Tg) and pressure(pg). Now I open the container. The gas will escape through the opening to the atmosphere in order to create a pressure balance. There will be no significant...

During mass measurement for a gas, why must you measure the gas, release some, and measure it again?

ok, I am having trouble understanding exactly what this problem wants from me, its asking: At what temperature would the translational rms speed of hydrogen molecules be equal to that of oxygen molecules at 300K? and the answer it gives me is 19K... but I really have no idea where to even...

A balloon is filled to a volume of 63.0 mL at a temperature of 58.0oC. The balloon is then heated up at constant pressure to a temperature of 93.0oC. What is the final volume of this balloon, in liters? We haven't even covered this yet in chem, but for some reason they are giving...

THEORY OF THE IONIZATION OF GASES BY LASER BEAMS could anyone help me about is theory ican't find it plase iknow i ask a lot :blushing: but sometime my mad don't work enough :confused:

A 1.00 mol sample of an ideal monatomic gas is at an initial temperature of 300 K. The gas undergoes an isovolumetric process acquiring 500 J of energy by heat. It then undergoes an isobaric process losing this same amount of energy by heat. Determine a) the new temperature of the gas and b)...

gases are kept in the air by their large kinetic energy, no? if we observed one particle in the atmosphere, however, would we not observe it to fall in a parabolic arc(in between collisions, which keep it propped up) much as a macroscopic particle would? this just gets me thinking...

I have been trying to understand the concept of specific heat ratios. From what I gather, the ratio is defined as the quotient of the Specific heat at constant pressure and the Specific heat ratio at constant volume. Could anybody give me an insight into what leads to gases having different...

which greenhouse gases is the most powerful? :eek:

Maybe some of you biology experts can help me with this problem https://www.physicsforums.com/showthread.php?p=245521#post245521 Thanks Nautica

Can someone please calculate the volume occupied at STP by 2.99times10 to the 23rd power molecules of Chlorine. Thank you Very much.

Hi all! This what I've done: First I pumped underpressure into a glass container, checked the manometer's reading and then weighed the container on two different scales. Then I opened the valve a bit, checked pressure and weighed the bottle etc. I did this 10 times. So what I've got is 10...

As temperature increases, the solubility of gases decreases, but why? Gary

do any exist (possibly an isotope?) or is it posible to create an ionized gas without heating it up (i.e. making it a plasma)?

Here's the problem: 4. A diving bell in the shape of a cylinder with a height of 2.10 m is closed at the upper end and open at the lower end. The bell is lowered from air into sea water ( p = 1.025 g/cm3). The air in the bell is initially at 16.0°C. The bell is lowered to a depth (measured...

We've been set the question of- In an isothermal expansion, and ideal gas at initial pressure Po expands until its volume is twice its initial volume. When the gas is compressed adibatically and quasi-statically ack to its original volume, its pressure is 1.32Po. Is the gas monatomic...

I was wondering if anyone could point me in the direction of some good information regarding why the solubility of gases decreases with the increase of temperature. The only description I have is a cheap example involving a pop can where as the temperature of the can is increased the kinetic...

need some explanation of these. a gas feels cold when it escapes through a small hole of a closed cylinder at high pressure. Explain this phenomenon based on the first law of thermodynamics. will the escaping gas above be cold if allowed o excape into a vacuum??

sorry but this si really hard for me i don't understand these 2 question. Explain why some noble gases such as Xe will form compounds and some such as Ne will not? What kinds of orbital arrangemenets contribute to the bonding in ethene H2C = CH2 thats a double bond i tried and i...

How is superfluidity studied in a BEC?

At what depth (roughly speaking) will gaseous oxygen dissolve (because of the surrounding pressure) into the water? Again, not asking for a precise figure. Thanks