Isobaric Definition and 84 Threads

Homework Statement An ideal gas of N particles is reversibly expanded from V1 to V2 = 4V1. The starting temperature T1 is known and E_1 = \frac{3}{2} N k_B T_1. As of yet E_2 is unknown. a) Express \Delta E = E_1 - E_2 in terms of the added heat Q and work done on the gas W. b) Calculate...

Assuming that the gas in these processes is an ideal one, is the change in internal energy in an isochoric process (volume remaining constant) the same as the change in internal energy of isobaric process (pressure remaining constant)? Mathematically I can derive that they're equivalent, but...

Howdy all, I have a final coming up, and I'm having a very difficult time grasping a few concepts about the ideal gas laws, specifically a problem with isobaric compression. Homework Statement Alright, the intro to the problem is: A quantity of ideal gas is slowly compressed to 1/3 of...

Homework Statement http://img140.imageshack.us/img140/2963/isobaricsteam.jpg P1 and P2 are 1 bar. V2 4.812 and V2 specific volume is 2.406 X1=0.6 Homework Equations v=vf+x(vf-vg) W=-P(v2-v1) Q=(u2+pv2)-(u1+pv1) The Attempt at a Solution Hi guys first timer here...

Homework Statement In case of an isobaric evaporation, why the temperature must be constant? Homework Equations I'm working on Mollier Diagram and my textbook says "because P is constant, so T is also constant", I coundn't understand it anyway The Attempt at a Solution

Homework Statement Describe what is meant by the term "Isobaric expansion". Homework Equations The Attempt at a Solution I've been all through my textbook and the web trying to find a "proper" definition.

Homework Statement There is a graph PxV. Pressure is obviously constant so it is a strait line and volume is from point A (1) to point B (3.5). You do not need to solve anything but it asks if work is being done on the system or by the system. Homework Equations U=Q-W The Attempt...

Homework Statement One mole of an ideal monatomic gas is taken through the cycle ABCA shown schematically in the diagram. State A has volume 0.0208 m3 and pressure 1.22 × 10 5 Pa, and state C has volume 0.0524 m3 Process CA lies along the 305 ±1 K isotherm. The molar heat capacities for...

Can anyone help me with understanding what is going on at page 11 of these notes? http://www.chem.utoronto.ca/coursenotes/CHM223/Section%205B%20Fall%202010.pdf Do you get why there is 2 delta Gs? I am really confused with what he was trying to do there? ΔG(37oC) – ΔG(25oC) ≈ – (T – 298)...

Homework Statement 21. A quantity of an ideal gas is compressed to half its initial volume. The process may be adiabatic, isothermal, or isobaric. Rank those three processes in order of the work required of an external agent, least to greatest. A. adiabatic, isothermal, isobaric B...

Homework Statement Initially, 2 kg of water is at 250 Celsius and it exists as a saturated liquid. It is now isobarically heated until all of it is converted to saturated vapor. Find final temperature and volume. Homework Equations Thermodynamic tables and the use of interpolation...

Homework Statement Pf 429 Q -754 ΔU 819 The table above shows the measurements taken while an ideal gas underwent an ISOBARIC process. Fill in the appropriate values for the table below. ΔP=? Homework Equations Q= ΔU+W=ΔU=PΔV The Attempt at a Solution I don't know how to go...

Hi guys, is this right? Homework Statement A mole of nitrogen is heated at constant external pressure of 1 atm from 25° C to 100° C. The heat capacity of nitrogen is 29.1 J/mol·K. Calculate ΔSsurr 2. The attempt at a solution delta_S=Q/T = -1*29.1*75/373=-5.85 J/K (heat...

Given: working fluid is an Ideal gas P=30 psi V=2ft3 T=20degreeC Q. what is initial state of the gas when? Isobaric expansion to 3ft3

NVM I solved it. Thanks for reading anyway :) Homework Statement 610 J of heat is added to 3.4 mol of a monatomic ideal gas at constant pressure. Find the change of temperature of the gas.Homework Equations At isobaric conditions, w = p\DeltaV = nR\DeltaT w = nR\DeltaTThe Attempt at a...

Just say an ideal gas goes through process such as isobaric, isochoric, quasistatic, adiabatic etc, is there any special cases where entropy is conserved, or am i thinking enthalpy. Also how is enthalpy found in adiabatic processes?

http://session.masteringphysics.com/problemAsset/1013990/12/1013990E.jpg Which of the following statements are true about the first half of this process, just going from state A to state F? Both T and U increase. W provides energy input. Q provides energy input. Q is larger (in...

Hi, So let's take the standard example of a gas in a container with a piston at the top. Charles' Law states that at constant pressure, an increase in temperature (kinetic energy of gas molecules) will increase the volume. This makes sense both conceptually and mathematically (per PV = nRT)...

[SOLVED] Isobaric process Hi, need some help with this. I got to moles of an ideal gas that are heated at constant pressure from T=27 C to T=107C. How do I calculate the work done by the gas? I know that for a isobaric process the work is given by W = p(V2-V1) Thanks

Homework Statement Chapter 15, Problem 26 The drawing refers to 5.30 mol of a monatomic ideal gas and shows a process that has four steps, two isobaric (A to B, C to D) and two isochoric (B to C, D to A). (a) What is the work done from A to B? (b) What is the heat added or removed from B to...

Homework Statement One mole of a monatomic ideal gas has an initial pressure, volume, and temperature of Po, Vo, and 442 K, respectively. It undergoes an isothermal expansion that triples the volume of the gas. Then the gas undergoes an isobaric compression back to its original volume...

Homework Statement 5.00 g of nitrogen gas at 22.0 deg C and an initial pressure of 2.00 atm undergo an isobaric expansion until the volume has tripled. A. How much heat energy is transferred to the gas to cause this expansion? Homework Equations Equation of Isobaric thermodynamic: W...

Homework Statement 4.20g of nitrogen gas at 22.0 C and an initial pressure of 2.30 atm undergo an isobaric expansion until the volume has tripled. A.)How much heat energy is transferred to the gas to cause this expansion? b.)The gas pressure is then decreased at constant volume until...

Hi! My Physics introductory book states the following: "A dew point is a state defined by the temperature to which the air has to be cooled isobarically (with constant absolute humidity) for the vapour to become saturated." Humidity is defined as m/V, where m is weight of the vapour, V is...

Homework Statement Consider 1 gram of an ideal gas undergoing isobaric process. Suppose del(H) be the amount of heat given to it. Then, del(H) = dU + del(W) del(H) = 1 x C(v)dT + (P.dV)/J...

A sample of ideal gas at constant pressure is heated from -10 degrees C to 100 degrees C. The gas does 40.0J of work during this process. How many moles of gas are present? What is the pressure of the gas at 100 degrees C? So far I've calculated the moles of gas present T1 = -10 degrees C T2...

This problem is going to make me go crazy... 4. In the figure below, an ideal gas is slowly compressed at a constant pressure of 2.0 atm from 10.0 L to 2.0 L. This process is represented as the path B to D. In this process, some heat flows out and the temperature drops. If the heat lost from...

I have a Pressure vs Volume Graph and A -> B. It's just an isobaric expansion, the work done by the gas is -3600 J. The gas is monatomic ideal (2.0moles). If I used it correctly, PV=nRT, I found the change in temperature to be 216.6K. My question is: How do I find the change in internal...

I am trying to make the connection from statistical mechanics to thermodynamics for the isothermal isobaric ensemble. Partition function = (sum of)exp(-BEj-gamma*Vj). I have followed T.L. Hill [Statistical Mechanics, p. 67] but can not understand how he justifies dE=(sum of)EdP, rather than...

Given: the thermal coefficient of expansion = 2.4 x 10^-5 (degrees C ^-1) A 2.8 kg block of aluminum is heated at atmospheric pressure so that its temperature increases from 20C to 43C. Find the work done on the aluminum. Answer in units of J. I originally wanted to do W=P∆V. I could...

Question: When a quantity of monatomic ideal gas expands at a constant pressure of 4.00 \times 10^{4} {\rm Pa}, the volume of the gas increases from 2.00 \times 10^{ - 3} {\rm m}^{3} to 8.00 \times 10^{ - 3} {\rm m}^{3}. A. What is the change in the internal energy of the gas? It's isobaric...

Hello Physics Forums users, I am stuck on a question. Can someone please help me out? Q. In a non-Carnot engine, a volume of 100 cm^3 of air, initially at 0 degrees celcius and 1 atm pressure, is compressed isothermally until its volume is 10 cm^3. The gas is then expanded at constant...

question: An ideal gas initially at 230 K undergoes an isobaric expansion at 3.65 kPa. If the volume increases from 1.7 m^3 to 6.8 m^3 and 25.1 kJ is transferred to the gas by heat, what is the change in its internal energy? i know that isobaric expansion means that the pressure is...

I have 3 probs I'm working on, not really sure how to go about these... 1) A gas, while expanding under isobaric conditions, does 611 J of work. The pressure of the gas is 1.70 x 10^5 Pa, and its initial volume is 1.30 x 10^-3 m^3. What is the final volume of the gas? I'm assuming I would...