Thermodynamic Definition and 459 Threads

Hey guys, I'm having some trouble finding thermodynamic tables for n-pentane and n-butane. Does anybody know where I can find them, whether it be in books or (a trust able) online source? Thanks.

Homework Statement A balloon containing 2.00 x10^3 m3 of helium gas at 1.00 atm and a temperature of 15.0°C rises rapidly from ground level to an altitude at which the atmospheric pressure is only 0.900 atm. Assume the helium behaves like an ideal gas and the balloon's ascent is too rapid to...

Hopefully somebody can help me with this. I have a final exam next week, and the textbook we use along with my professor didn't do a good job explaining what happens in irreversible reactions. More specifically, what differences are there between reversible and irreversible processes of...

Can you help me solution: The PWR plant of Figure 6-6 operates under the conditions given in Table 6-6. Assume that the turbine and pump have isentropic effciencies of 85%. 1. Draw the temperature-entropy (T-s) diagram for this cycle . 2. Compute the ratio ,of the...

I am wondering why water is used instead of air for the cold temperature source for a thermo cycle. My guess is the higher specific heat, which means the condenser unit can be smaller, and the mass flow rate less, which reduces the overall cost. Are there any other reasons to choose water...

Homework Statement Assuming V is a function of P and T such that V = V(P,T) express the differential changes in volume due to differential changes in Temperature and pressure, what is the fractional/relative change? Homework Equations The Attempt at a Solution since V is a...

Homework Statement Derive the following general relation : \left(\frac{\partial T}{\partial V}\right)_{S} = - \frac{1}{C_{V}} T \left(\frac{\partial p}{\partial T}\right)_{V} Homework Equations Maxwell's Relation : \left(\frac{\partial T}{\partial V}\right)_{S} = - \left(\frac{\partial...

Homework Statement Hi! I apologize in advance for my knowledge of vocabulary in this topic:) OK, so we have a Melde-tube 55 cm long, T=293K, with the top of it open, and a 20cm Hg part cutting off 30cm of air when is equilibrium. The original problem asked how much we can heat the air so...

Homework Statement The van der Waals’ equation of state for one mole of gas is given by (P+a/V2)(V-b)=RT where V is the molar volume at temperature T, and a and b are constants. The internal energy of the gas is given by E=(3/2)RT-a/V Initially, one mole of the gas is at a temperature T1...

Homework Statement A steel tank of cross sectional area 3 m2 and height 16 m weighs 10,000 kg and is open at the top. We want to float it in the ocean so that it is positioned 10 m straight down by pouring concrete into its bottom. How much concrete should we use? Homework Equations...

A rigid vessel of volume 0.1185 m3 contains one kg of steam‐water mixtures at 5 bar. If heat is added to the vessel until the pressure reaches 20 bar. Sketch a suitable state diagram to represent the process. How do i draw the state diag since pressure is not constant? So is this a case...

Homework Statement A gas enters a compressor and is compressed isentropically. Does the specific enthalpy (h) increase or decrease as the gas passes from inlet to exit? Homework Equations \left(\frac{\partial{h}}{\partial{p}} \right)_s= v\qquad(1) The Attempt at a Solution Since...

how do you read of these tables to get them filled. Can you please show me how to do them not do them for me only please do 1 of each showing me how to do them for each. Doing past exams papers for the test coming up after summer and will need this one as it appears in most papers. The most...

Hello, In my old papers, I could find a nice P-T diagram for Carbon Dioxide. I am interrested in liquid-gas equilibrium data, specially enthalpy and internal enery. Unfortunately, the diagram doesn't fit very well my current purpose. Moreover, I would like to make more use of my computer...

Hey folks, I am looking for something free to help me out here. I have experimental data that consists of the temperature and pressure of a gas over time. That is I have (T1,P1), (T2,P2),...(Tn,Pn) where n might be upward of a 500. I would like to be able to determine the specific volume...

How to choose thermodynamic cycle for designing new jet engine? While designing new jet engine what parameters are important for choosing thermodynamic cycle? what other parameters are important for jet engine designing?

Homework Statement When a sealed Thermos bottle of hot coffee is shaken, what changes, if any, takes place in the temperature of the coffee and its internal energy? Justify your answer. Homework Equations Internal energy = random kinetic energy + random potential energy The Attempt...

In my opinion the nature of the second law of thermodynamic is probabilistic and it sholud be formulated in a way which determine probability that given proces occurs (the probability should depened on the tatal entropy change, if its negative the proces is very unlikely but in principle...

Here are some general questions regarding my current reading. I am looking in my text at 2 equations for specific energy and specific enthalpy: u = u(T,v)\qquad(1) h = h(T,p)\qquad(2) Question 1: Are not the properties fixed by any 2 independent priorities? Why have we chosen to...

I am reading through a thesis paper and it says that for a combustion process in which we have separated the chamber into 2 zones: burned and unburned ideal gas mixtures, if we know the pressure and equivalence ratio (ER) for the unburned ideal gas mixture, we can find all of its thermodynamic...

"Open" and "closed" in the geometrical sense vs the thermodynamic sense Perhaps this is a silly question, but what is the relationship between the words "open" and "closed" in the geometrical sense (open, flat, closed universes) and in the thermodynamic sense (open and closed systems) in the...

I have some questions about thermodynamic potentials (internal energy U, enthalpy H, Helmholz free energy F, Gibbs free energy G): 1. The differentials of potentials: dU<=TdS-pdV dH<=TdS+Vdp dF<=-SdT-pdV dH<=-SdT+Vdp Do this equations apply only for a single homogeneous system or can...

Homework Statement Specify at least two ( physical or chemical), real world, processes for each of this cases: a) Internal energy is constant b) Entalpy is constant c) Gibbs free energy is constant d) Helmholtz free energy is constantHomework Equations a) dU = TdS - pDV = 0 b) dH = TdS...

Homework Statement 4 liters of an ideal diatomic gas are compressed in a cilinder. In a closed process, the following steps are taken : 1) Initial state : p_1 = 1 atm = 1.013*10^5 N/m^2 and : T_1 = 300 K 2) Isochoric proces resulting in : p_2 = 3.p_1 3) Adiabatic expansion resulting in...

Homework Statement The rate of heat loss to the outside through a 10mm-thick glass roof of a green house is 120kW. The length and breadth of the glass material of the roof are 20m and 2m, respectively. Calculate the temperature of the outside if the temperature inside the green-house is 25...

Homework Statement Two moles of an ideal monoatomic gas trebles its initial volume is an isobraic expansion from state A to state B. The gas is then cooled ischorically to state C and finally compressed isothermally until it returns to state A. The molar gas constat is: R = 8.314 J mol^-1...

Homework Statement The Gibbs free energy of benzene decreases continuously with temperature (at fixed pressure) and shows three nearly linear segments corresponding to the solid, liquid and gas phases. The magnitude of the slopes increases as one moves from solid to liquid, and liquid to...

Homework Statement Two moles of an ideal monoatomic gas trebles its initial volume in an isobaric expansion from state A to state B. The gas is then cooled isochorically to state C and finally compressed isothermally until it returns to state A. The molar gas constant is R = 8.314 J mol–1...

Homework Statement I can't aolve the following question: Two moles of an ideal monoatomic gas trebles its initial volume in an isobaric expansion from state A to state B. The gas is then cooled isochorically to state C and finally compressed isothermally until it returns to state A. The...

Alright, I'm confused about why thermodynamic cycles can never have 100% efficiency. There reversible processes right? And a reversible process has zero change in entropy, so then why can't they achieve 100% efficiency. I thought entropy was the measure of energy that cannot be used. How would...

what is thermodynamic potential?

Homework Statement http://www.docstoc.com/docs/14364187/Heat_-Temperature_-Thermodynamics-and-Heat-Engines-Problem-Set This question I am trying to figure out is Number eight with the four cylinders. Homework Equations P=F/A PV=nRT The Attempt at a Solution I'm stuck at trying to...

Why is it that the The fundamental thermodynamic relation dU = Tds - PdV works in general even though Tds > dQ for irreversible processes. Likiewise PdV >/= dW for irreversible processes. Do the two irreversible effects cancel out. How does this happen physically.

Homework Statement To state the differential form of the Helmholtz thermodynamic potential and derive the corresponding Maxwell's relation. Homework Equations Stated within the solution attempt. The Attempt at a Solution Helmholtz function: F = U - TS Calculating the...

Homework Statement I. Finding the partition function Z. II. If the middle level (only) is degenerate, i.e. there are two states with the same energy, show that the partition function is: Z = (1+exp(\frac{-\epsilon}{k_{B}T}))^{2} III. State the Helmholtz free energy F of the...

Im looking for thermodynamic properties of seawater, especially specific heat and enthalpy. I am designing a solar desalinator, and I am trying to determine the required amounts of energy to evaporate the water. Is there a way in which I can determine the enthalpy of seawater by knowing the...

Homework Statement A monatomic ideal gas is compressed adiabatically from a pressure of 1.19e5 Pa and volume of 250 L to a volume of 32.0 L.(a) What is the new pressure of the gas in Pa? (b) How much work is done on the gas?Homework Equations I know that W= Average P (Delta V) The Attempt at...

Homework Statement A cylinder with a piston contains 0.250 moles of oxygen at 2.40 * 10^5 Pa and 355K. The oxygen may be treated as an ideal gas. The gas first expands isobarically to twice its original volume. It is then compressed isothermally back to its original volume, and finally it is...

Hello! Does anyone have a free ebook of Chemical Thermodynamic by Peter Rock A.?

http://arxiv.org/abs/1001.4090"

if i have calorific value of mixture, volume at time of compression, bore diameter, can i know the pressure being exerted on the pistons due to the combustion?

Hello! I would like to ask anyone who can have documents about the thermodynamic properties of CsCl, Cs2Cl+, CsCl2-,Cs3Cl2+,Cs2cl3- to send me the links please. or anything else that can be related to thermodynamic properties of heavy ions. Actually i want to make a research on their...

Homework Statement This is my problem: i have a container with humid (say psi = 60%) air at a pressure of 450 bar. i need to know to what preesure can this air be expanded (adiabatically) so that it reaches temperature just above freezing. i also need to know how much work is extracted from...

The probability distribution for some thermodynamic variable x is given by P = N e^{-A(x)/KT} where A(x) is the availability, which can be replaced by Hemlholtz free energy F, Gibb's free energy G, etc depending on the conditions imposed. N is just some normalization constant. A(x) can be...

Homework Statement I am supposed to see if there is a feasibility of producing power in the 0.1-0.25 kW range. I am working with a thermosyphon Rankine power plant. It is an open ended design problem My question is that I am getting hung up on finding the mass flow rate. My professor...

This has probably been posted/asked here before as it seems quite basic, but I can't seem to find a thread on it using the search function. According to conventional cap theory (0.5cv^2), two identical caps in series can store twice as much energy as two in parallel (provided the caps in...

Can Anyone Show Me the Steps to solving for these equalities; the proofs for them as it were: Prove that, (dT/dP)s=TV((alpha)p/Cp) and, Cp/Cv=Kt/Ks=gamma and, Cp(Kt-Ks)= TV((alpha)p)^2 (alpha)p = coefficiant of thermal expansion, Kt= isothermal compressibility, Ks=...

Consider the following cyclic process: Each cycle 800J of Energy is transferred from a reservoir at 800K and 600J of energy from a reservoir at 600K. 400J of heat is rejected to a reservoir at 400K and 1000J of work is done. I think that the process doesn't violate the first or second laws...

Hi, Anyone know where I can find thermodynamic properties of gases at high pressure? More specifically I need to find the kinematic viscosity or the absolute viscosity of air at around 300 degrees Kelvin and 330 bar. Cheers

Homework Statement Derive the following: \left(\frac{\partial U}{\partial V}\right)_{T}=T\left(\frac{\partial p}{\partial T}\right)_{V}-p Homework Equations Use the partner equation: \left(\frac{\partial H}{\partial p}\right)_{T}=-T\left(\frac{\partial V}{\partial T}\right)_{p}+V...