Ideal gas Definition and 823 Threads

Hi group, Simple arithmetic problems using PV = nRT or NkT. How do you know when to use pressure units in atmospheres or pascals? For example, in 1 particular problem they give you a pressure in units of Torr, volume in cubic cm and temp in Kelvin and ask for the number of molecules. Couldn't...

For the free expansion of an ideal gas into an evacuated chamber, I know that Work=0 and Q=0. Correct? This implies that the change in internal energy dU also equals 0. Since U depends solely on T, this should mean that the final temperature of the chamber is equal to the temperature of the...

Hi there, I have a problem that I believe I am doing correctly, but my answer proves otherwise. I was hoping someone could take a look and let me know where I'm going wrong. Here's the problem: A gas fills the right portion of a horizontal cylinder whose radius is 5.10cm. The initial...

Hey, my textbook is not helping at all. Here's the problem followed by what I've done on it so far. A sample of an ideal gas is taken through the cyclic process abca shown in Fig. 20-20; at point a, T = 241 K. graph: http://www.webassign.net/hrw/20_20.gif There are two parts of the...

Hello, I am having some difficulty following the method for finding an equation for an ideal gas. There are a few different forms, but I'm proving 1. For an indiviual particle of a gas in a cube container side length L, it is traveling with a velocity of u1 on the x-axis (its x component of...

Why does the Van Der Walls equation give a less value for pressure than the Ideal Gas equation does?

I think this is a ideal gas/ thermal expansion problem. A cylinder is closed by a piston connected to a spring of constant 2*10^3 N/m. With the spring relaxed, the cylinder is filled with 5 L of gas at a pressure of 1 atm and a temperature of 20 degrees Celsius. a) If the piston has a...

can anyone give me an equation for the rate that an ideal gas expands in a temperature change. like when a gas goes from 30 degrees to 50 degrees in a baloon. how quickly would it expand?

There are some problems which have me completely stumped. 1. A balloon has a volume of 10.5dm^3. Its mass is 8.5g and inside is helium at a pressure of 1.05atm. Atmospheric pressure is 1.00atm and both the helium and the outside air is 25.0C (degrees Celcius). Define the tension in the...

Hi, I am working on a project in which I need to know the distance between the particles in an ideal gas system. I have tried searching (google) for it but was unable to come with any actual values, just general terms. Can anyone refer me to where I might find this? Thanks

I posted this in the College Level Help forum, but no one responded. I really need some explanation on this, so I'm moving this post from that forum to this. Thanks in advance: Can someone explain why the pressure due to an ideal gas in a container is given by P = \frac{1}{3}\rho<c^2>? (rho...

I'm having trouble with this problem. Here's what I know: Since the gas is ideal, we can describe the initial state of the first container with: p_1 V = n_{1i} R T_1 Where p1 is the pressure in the first container, V is the volume of the first container, n1i is the initial number of...

Okay, I've been working on this for a while: Three-tenths mole of an ideal gas at 400K is expanded isothermally from a pressure of 5x10^5 N/m^2 to 1.5x10^5N/m^2. If the gas is then heated to 500K at constant volume and then is compressed isothermally back to 5x10^5 N/m^2, and then...

Hello, I am in the middle of revising topics for the materials section of myend of year exam. For some reason my department give out past papers but do not give out answers. Any answers to any of the follwing questions would be very helpful. I don't think too much detail is required just a...

Problem1. A cylinder with a movable piston contains gas at a temperature of 42 degrees Celicius, with a volume of 40m^3 and a pressure of 0.233*10^5 Pa. What will be the final temperature of the gas if it is compressed to 0.728 m^3 and its pressure is increaded to 0.609*10^5 Pa? Answer in K...

Problem1. A cylinder with a movable piston contains gas at a temperature of 42 degrees Celicius, with a volume of 40m^3 and a pressure of 0.233*10^5 Pa. What will be the final temperature of the gas if it is compressed to 0.728 m^3 and its pressure is increaded to 0.609*10^5 Pa? Answer in K...

Hi, not sure if this is the right forum to ask this in, but I was trying to convert the ideal gas law constant R (from PV = nRT) from: 8.31 (Pa * cu. meters) / (mol * Kelvin) to the equivalent: 10.73 (psia * cu. ft) / (lb. * mol * Rankine) Here's the conversion factors I've been using...

Given: R=8.31451 J/(K*mol) Two moles of helium gas initially at 187 K and 0.33 atm are compressed isothermally to 0.57 atm. Find the final volume of the gas. Assume the helium to behave as an ideal gas. Answer in units of m^3. I've tried this many many times and i keep getting 5.455...

Hey guy, I didnt think i would ever have to deal with gas laws after i got out of AP chem, but it has showed up again in physics. Tell me what to do. Suppose the volume of a balloon decreases so that the temperature of the balloon decreases from 280K to 240K and its pressure drops from...

Hi, I'm having some trouble doing my homework for Physics. I would appreciate it if anybody would help me or lead me in the right direction. Thank you. 1. Gas is confined in a tank at a pressure of 1.0x18^8 Pa and a temperature of 15.0 degrees Celcius. If half the gas is withdrawm and the...

Hi, I would appreciate any help with this: A monatomic ideal gas is used as the working substance for the Carnot cycle. Processes A => B and C => D are isothermal, while processes B => C and D => A are adiabatic. During process A => B, there are 400 J of work done by the gas on the...

I have a few homework problems on the Ideal Gas Laws, was wondering if someone could help me out with a few of the problems. 1) Hemoglobin has a molecular mass of 64 500 u. Find the mass (in kg) of 873 molecules of hemoglobin. Here's what I did: (64500 g/mol/6.022x10^23 mol^-1)(873...

I have the question, "Heat is added to an ideal gas at 20 degrees C. If the internal energy of the gas increases by a factor of three - what is the final temperature (in degrees C) round off to the nearest whole number?" I know U=3/2NkT or U= 3/2nRT I see I have 3U and I need to convert 20...