Search: thermodynamic

Number of results: 111

physics
can i have multiple choice questions on thermodynamics: relationship between work and heat, the first law of thermodynamic, and the second law of thermodynamic
Friday, March 18, 2011 at 7:02pm by johny

Biochemistry: Thermodynamic measurements
Thermodynamic measurements in water reveal that the bidingin fo a Zinc Finger to target RNA has a delta H note of -7.2 kcal/mol and a delta S note of 12 cal/ mol K. What is the equilibium constant for the binding reaction at 25 degrees C?
Thursday, August 28, 2008 at 11:06am by Hayley

Thermodynamic
e is the answer, if S is entropy
Friday, March 22, 2013 at 9:28pm by drwls

Thermodynamic
274.2kj
Monday, January 10, 2011 at 1:22pm by lala

thermodynamic
what is the difference between thermodynamics and heat transfer
Monday, June 20, 2011 at 2:12pm by mm

chemistry
Can thermodynamic quantity, delta G, be used to predict the speed of a reaction in a living organism? Why and why not?
Wednesday, October 6, 2010 at 12:37pm by nikki

Chemistry
The only problem is that when I looked up the thermodynamic values I could not find MgCl2(aq) so would this just be 0?
Tuesday, February 14, 2012 at 10:16am by Hannah

Chem Check
The first law of thermodynamics is the application of the conservation of energy principle to heat and thermodynamic processes.
Thursday, June 10, 2010 at 8:39pm by Amy~

chemistry
2 NO(g) + 1 O2(g) <==> 2 NO2(g) Calculate K, the equilibrium constant, from thermodynamic data at 289 K. (Hint #1: Assume that S and H do not change with temperature.)
Tuesday, December 7, 2010 at 3:41pm by Anonymous

chemistry
What are three thermodynamic quantities that are not state functions and three that are?
Tuesday, October 5, 2010 at 11:24pm by nicki

chemistry
on my selected thermodynamic data i cant find delta H for SiCl4(L) (i can solve the reaction i just cant figure out what SiCl4(L) is.
Monday, May 14, 2012 at 4:59pm by maddy

Thermodynamics
A cylinder contains one liter of air at room temperature (300 K) and atmospheric pressure (10^5 N/m^2). At one end of the cylinder is a massless piston, whose surface area is 0.01 m^2. Suppose that you push the piston in very suddenly, exerting a force of 2000 N. The piston ...
Saturday, February 23, 2013 at 2:24pm by Jane

Chemistry
If the internal energy of a thermodynamic system is decreased by 300 J when 75 J of work is done on the system, how much heat was transferred, and in which direction, to or from the system?
Sunday, November 2, 2008 at 3:28pm by N/A

Chemistry
For the reaction: 2 NO(g) + 1 O2(g) <--> 2 NO2(g) Calculate K, the equilibrium constant, from thermodynamic data at 281 K. (Hint #1: Assume that S and H do not change with temperature.) (Hint #2: Work in J/mol)
Monday, January 2, 2012 at 4:36pm by Summer

thermodynamic
heat transfer generally means heat conduction or radiation. Thermodynamics adds to this the quantity of time, and the heat storage content of materials and matter.
Monday, June 20, 2011 at 2:12pm by bobpursley

chemistry
calculate the standard molar entropy change for the combustion of methane gas using S naught values from standard thermodynamic tables. Assume that liquid water is one of the products.
Friday, October 5, 2012 at 10:24pm by Bru

Chemistry
For the reaction below 2 CH3OH(l) + 3 O2(g) 2 CO2(g) + 4 H2O(g) calculate Srxn at 298 K. (Hint: Use a table of thermodynamic data commonly found at the back of chemistry textbooks.)
Sunday, January 1, 2012 at 5:40pm by Summer

Chemistry
Use the data from this table of thermodynamic properties to calculate the maximum amount of work that can be obtained from the combustion of 1.00 moles of ethane, CH3CH3(g), at 25 °C and standard conditions. I absolutely have no idea what to do, please help me!
Tuesday, April 30, 2013 at 7:38pm by Dee

science
It sinks to the bottom of the mug. Temperatures do not change, since there is thermodynamic equilibrium when temperatures are equal. This is true no matter what the masses of ball and mug are.
Monday, May 17, 2010 at 5:36am by drwls

Thermodynamic
One Kg steam with a quality of 0.2 is heated in a piston / cylinder vessel at a constant pressure of 200 KPa unit the temperature reaches 400 degree C. calculate the work done by the steam.
Monday, January 10, 2011 at 1:22pm by chris

chemistry
When the equilibrium constant K at 25oC for 2 O3(g) = 3 O2(g) is calculated, using thermodynamic data(use delta G values), the value obtained is a. ) 1.5 x 1057 b. ) 4.1 x 1028 c. ) 2.3 x 10-27 d. ) 130 e. ) 5.6 x 10-58
Sunday, November 23, 2008 at 1:01am by Anonymous

Chemistry
Entropy is a thermodynamic quantity that predicts the spontaneity of a reaction. Is this statement always true? Explain your answer with meaningful arguments. I assume the answer is no, but I cannot give a meaningful reason.
Thursday, April 18, 2013 at 9:53am by Saskia

science
I can't decipher the f+cents mark but I assume you want to calculate So for the reaction at 25 C. Look in your book at the thermodynamic tables and find So for each material. Then (sum So products)-(sum So reactants) = So reaction.
Sunday, August 1, 2010 at 7:54pm by DrBob222

chemistry
Suppose you do not know the enthalpy of decomposition of the process: CaCO3 = CaO + CO2 Explain in terms of thermodynamic parameters why heating to a high temperature might turn this decomposition to a spontaneous process.
Thursday, April 18, 2013 at 10:10am by Catherine

Chemistry
At which temperature will the following reactions reverse? Use the thermodynamic date provided at the end of the book. a) 2Ca(s) + O2(g) -> 2CaO(s) b) 2CH4(g) + 4 O2(g) -> 2CO2(g) + 4H2O(g)
Thursday, April 7, 2011 at 12:32am by Amber

Chemistry
2 H2O (l) → 2 H2 (g) + O2 (g) Using the thermodynamic values to calculate accurate values of ΔHr and ΔSr, will the reaction be product favored at high temperature? Why? Thank you
Friday, November 5, 2010 at 9:03pm by John

thermodynamic
N2 is described by its state properties of temperature @ -100 degree C, and Pressure @ 10.0 MPa. Determine if it is reasonable to assume that the given substances behaves as a real or non-ideal substance determine its compressibility factory Z.
Saturday, January 8, 2011 at 5:02pm by chris

thermodynamic
Calculate the work necessary to compress air in an isolated cylinder with initial and final volumes of 6.0 and 1.2 ft^3, respectively. The initial pressure and temperature are 30.0 psia and 50 degree F, respectively.
Saturday, January 15, 2011 at 10:56pm by chris

Physics
During a certain thermodynamic process a sample of gas expands and cools, reducing its internal energy by 3690 J, while no heat is added or taken away. How much work is done during this process?
Sunday, February 19, 2012 at 4:29pm by Ivan

chmistrye
Using the data in this table of the thermodynamic quantities for selected substances and given the pressures listed, calculate ƒ¢G at 25‹C for each of the following reactions (a) N2(g) + 3 H2(g) ¨ 2 NH3(g) PN2 = 2.0 atm, PH2 = 5.4 atm, PNH3 = 2.2...
Sunday, April 7, 2013 at 7:19pm by sarah

chemistry
A certain voltaic cell has a standard cell voltage of 1.22 V, and 3 electrons are transferred in the overall cell reaction. What is the value of the thermodynamic equilibrium constant for this cell reaction at 298K?
Tuesday, March 15, 2011 at 2:36pm by will

Chemistry
For the reaction 1 CaCO3(s) + 2 HCl(aq) <==> 1 CaCl2(aq) + 1 H2O(l) + 1 CO2(g) Calculate K, the equilibrium constant, from thermodynamic data at 293 K. (Hint #1: Assume that S and H do not change with temperature.) (Hint #2: Work in J/mol)
Wednesday, December 14, 2011 at 9:42am by Faith

chemistry
The following reation has the following standard thermodynamic parameters: delta H= -33.6 kJ/mol delta S= -59.8 J/(mol*K). C(g) + D(g) --> E(g) Calculate the temperature at which the reaction becomes nonspontaneous.
Friday, October 5, 2012 at 9:16pm by Brunette

thermodynamic
A rigid vessel of 1m^3 contains steam at 20 bar and 400 degree C. the vessel is cooled until the steam is just dry saturated. Calculate the mass of steam in the vessel.
Sunday, July 17, 2011 at 3:43pm by Amber

Chem
2 H2O (l) → 2 H2 (g) + O2 (g) Using the thermodynamic values to calculate accurate values of ΔHr and ΔSr, will the reaction be product favored at high temperature? Why? r stands for reaction
Friday, November 5, 2010 at 10:43pm by Melissa

chemistry
for thermodynamic, standard is 25 celsius and 10^5 Pa, so in this case does it mean that 1atm=10^5 Pa while for stp 1atm=101325 Pa
Sunday, March 14, 2010 at 5:09pm by bme1

Chemistry
The following thermodynamic data was obtained for an unknown compound. Delta Hvap = 31.3 kj/mol and Delta S Vap= 79.7 kj/mol .Calculate the normal boiling point of this compound in Celcius.. Thank you!
Monday, April 29, 2013 at 10:01pm by Chloe

chemistry
The standard state for a gas is given in your chemistry textbook. The standard states for pure substances and solutes may also be given in the title of tables of thermodynamic properties. I think you can look this one up in your own textbook.
Sunday, May 17, 2009 at 6:21pm by GK

thermodynamic
The air 10 cm diameter cylinder, as shown below, is heated until the spring is compressed 50mm. Find the work done by the air on the frictionless piston. The spring as the beginning of this process has a displacement of 0.0m with a spring constant of K=10KN/m. (assume Patm=101...
Sunday, January 9, 2011 at 7:03pm by chris

chemistry
See here for examples of state functions. http://en.wikipedia.org/wiki/Thermodynamic_state#State_functions See here where you note "processes" are non-state functions first reference). http://www.google.com/search?q=thermodynamic+non-state+functions&ie=utf-8&...
Tuesday, October 5, 2010 at 11:24pm by DrBob222

Chemistry
Find the ionic strength of the solution and the activity coefficients. Use the activity coefficients to convert Ka of 1.52E-5 (the thermodynamic Ka) to K'a, the concn K for acetic butanoic acid. Then set up an ICE chart and solve for (H^+). Post your work if you get stuck ...
Tuesday, March 12, 2013 at 10:49pm by DrBob222

chemistry.
The thermodynamic equilibrium constant for the following reaction is 0.15 at 1227°C. 2 SO2(g) + O2(g) 2 SO3(g) Which is true? Can be more than one answer. a. The reaction is product-favored. b. The reaction is reactant-favored. c. G°is less than zero. d. G° is ...
Friday, November 19, 2010 at 6:56pm by carla

CHEm. help please
The thermodynamic equilibrium constant for the following reaction is 0.15 at 1227°C. 2 SO2(g) + O2(g) 2 SO3(g) Which is true? Can be more than one answer. a. The reaction is product-favored. b. The reaction is reactant-favored. c. G°is less than zero. d. G° is ...
Friday, November 19, 2010 at 8:30pm by carla

PHYSICS
A thermodynamic system undergoes a process in which its internal energy increases by 480 J. At the same time, 220 J of work is done by the system. Find the energy transferred to or from it by heat? I TRIED ADDING 480+220 TO GET 740 but it says it is not the right answer, how ...
Thursday, October 16, 2008 at 4:26pm by SARA

AP Chem!
Probably not without knowing your teacher. Open ended could be anything from trivial to substantive. Know what bp of gases is, know the failures of the ideal gas assumptions, Daltons law of partial pressures, Law of effusion, and of course thermodynamic considerations. But ...
Sunday, October 5, 2008 at 7:58pm by bobpursley

Chemistry
Given the following thermodynamic data, 2H2O(g) → O2(g) + 2H2(g) ∆Hrxn = 483.6kJ H2O(g) → H2O(l) ∆Hrxn = −44.0kJ What is the molar heat of formation for liquid water, H2O (l)? Answer in units of kJ/mole
Tuesday, September 27, 2011 at 9:47pm by Dutch

Chemistry
Explain the significance of positive and negative values for each thermodynamic quantity in the free energy equation. (enthalpy change, entropy change, and free energy change) I think this is something you can find in your text/notes. If not, explain what you don't ...
Monday, May 14, 2007 at 10:39pm by Dave

Chemistry
The following reaction has the following standard thermodynamic parameters: Reaction: C(g) + D(g)----> E(g) Delta H rxn=-26.1kJ/mol and Delta S rxn=-69.8J/(mol*K). Calculate the temperature at which the reaction becomes nonspontaneous.
Tuesday, January 31, 2012 at 7:04pm by Kay

sci-please revise
The Flow of Energy Through Ecosystems. Then, complete Appendix C and respond to the following: Identify the fruit or vegetable you selected and relate the second law of thermodynamics to the changes in energy observed in Appendix C. How did the amount of energy gained compare ...
Tuesday, June 24, 2008 at 10:55pm by rose-

Chemistry
CH3OH(l) + 1.5 O2(g) > CO2(g) + 2 H2O(l) You get rid of fractions in chemistry the same as in math. If it's a 1/2, just multiply by 2. 2CH3OH + 3O2 ==> 2CO2 + 4H2O For 1/3 multiply by 3.For 1/4 multiply by 4, etc. MOST times we need whole numbers to balance ...
Thursday, July 2, 2009 at 12:46am by DrBob222

chemistry
There are various thermodynamic cycles in internal combustion and "steam" external combustion engines. I suggest you review Otto cycle (four-stroke automobile), Stirling cycle, Clerk cycle (two stroke), Diesel cycle and Rankine cycle (steam), using Google.
Thursday, February 11, 2010 at 3:26am by drwls

thermodynamic
Energy is added to a piston-cylinder arrangement. The piston is withdrawn in such a way that the temperature remains constant. The initial pressure and volume are 200 KPa and 2m^3, respectively. If the final pressure is 100 KPa, determine the work done by the ideal gas on the ...
Sunday, January 9, 2011 at 12:02pm by chris

Thermodynamic
N2 is described by its state properties of temperature @ - 100 Degree C, and pressure @10.0 MPa. Determine if it is reasonable to assume that the given substance behaves as an ideal gas at the specified state. If the substance is determined as a real gas or non-ideal substance...
Monday, January 10, 2011 at 1:19pm by chris

Physics
2. A Sample of V1=6.2L of pure nitrogen gas at 21.85 degrees Celsius and total pressure (gauge plus ambient) of p1=155,700 Pa is heated so that the vrms for the gas molecules increase by 9%. Find the new absolute temperature for the gas, and compute the pressure for the ...
Tuesday, January 22, 2013 at 5:43pm by Dawna

thermodynamic
An air tank with a volume of 20m^3 is pressurized to 10 MPa. The tank eventually reaches room temperature of 25 degree C. If the air inside is allowed to escape without any heat transfer to the environment unit reaches a pressure of 200 KLPa, find the remaining mass of air in ...
Saturday, January 15, 2011 at 10:56pm by chris

Chemistry
You need to look in your text for a set of thermodynamic tables and apply the following: delta H(rxn) = delta H products - delta H reactants. delta S(rxn) = delta S products - delta H reactants. Then delta G = delta H - T*delta S.
Friday, September 19, 2008 at 1:43am by DrBob222

thermodynamic
A heat pump is proposed that uses 50 degree F ground water to heat a house to 70 Degree F. The groundwater experiences a temperature drop of 12 degree F. If the house require 75,000 Btu/hr, Calculate the minimum mass flux of the groundwater and minimum HP required for the pump.
Sunday, January 16, 2011 at 10:30am by chris

Chemistry
Iron(III) oxide can be reduced by carbon monoxide. Fe2O3(s) + 3CO(g) 2Fe(s) + 3CO2(g) Use the following thermodynamic data at 298 K to determine the equilibrium constant at this temperature. Substance: Fe2O3(s) CO(g) Fe(s) CO2(g) ΔH° f (kJ/mol): -824.2 -110.5 0 -...
Thursday, March 31, 2011 at 5:56pm by Bea

thermodynamic
1.5kg water in a closed system initiallu have a pressure of 700 kPa and x=0.7.Then,water had been expanding at constant temperature process until the pressure decrease to 150kpa.During the process,1000kJ heat was transferred to the system.Determine the final temperature and ...
Thursday, November 1, 2012 at 9:57am by SYAZWANI URGENT

chemistry
Oxygen reacts with the dipeptide glycylglycine [C4H8N2O3(s)] to form urea [CH4N2O], carbon dioxide and water: 3O2(g) + C4H8N2O3 (s)  CH4N2O (s) + 3CO2(g) + 2H2O(l) At STP, solid glycylglycine has the following thermodynamic properties: = -491.5 kJ/mol = -746.0 kJ/...
Wednesday, February 11, 2009 at 8:22pm by Tillie

chemistry
Calculate deltaG from deltaH and deltaS. Use the table of standard thermodynamic data. calculate deltaG at 0 degrees C for CH3CH2CH3 + 5O2 --> 3CO2 + H2O. CH3CH2CH3 + 5O2 --> 3CO2 + 4H2O I've balanced the equation so far, I know that deltaG = delatH - T(...
Monday, November 30, 2009 at 10:22am by Bob

Thermodynamics
Oxygen reacts with the dipeptide glycylglycine [C4H8N2O3(s)] to form urea [CH4N2O], carbon dioxide and water: 3O2(g) + C4H8N2O3 (s) -> CH4N2O (s) + 3CO2(g) + 2H2O(l) At T=298.15 K and 1.00atm, solid glycylglycine has the following thermodynamic properties: DeltaGf= -491...
Monday, November 22, 2010 at 4:26pm by Jill

Chemistry
(1) Use the thermodynamic values to (a) deduce the enthalpy change of each reaction (b)state if the reaction is exothermic,or endothermic,and also how much energy is released or absorbed. For thi reactions; (1) NH4NO3 (s)------>N2 (g) + 2H2O (l) (2) 4Zn (s) + 9HNO3 (aq...
Tuesday, March 12, 2013 at 3:55pm by Shane

Physical-Chemistry
Protein denaturations are usually irreversible but may be reversible under a narrow range of conditions. At pH 2.0, at temperatures ranging from about 40o C to 50o C, there is an equilibrium between the active form P and the deactivated form D of the enzyme trypsin: P ¡&...
Wednesday, October 18, 2006 at 4:40am by Paul

Thermodynamics
Design Problem- A steam boiler may be thought of as a heat exchanger. The combustion gases may be modeled as a streram of air because their thermodynamic properties are close to those of air. Using this model, consider a boiler that is to convert saturated liquid water at 500 ...
Wednesday, October 31, 2012 at 3:24pm by Alyssa

Inorganic chemistry
Calculate the standard reduction potential for the following reaction at 25 degrees Celsius Ag(NH3)2^+(aq) +e^- ==> Ag(s) + 2 NH3(aq) given the following thermodynamic information Ag^+(aq) + e^- ==>Ag(s) E naught = 0.799V Ag^+(aq) + 2NH3(aq) ==> Ag(NH3)2...
Saturday, April 11, 2009 at 10:18pm by Steve

physical chemistry
1 kg aluminum dumbbell initially held 2 meters above the floor is allowed to fall. This experiment is performed inside a room whose dimensions are 10m × 5m × 3m. Assuming that the walls of the room do not conduct heat and that the room is empty (no other objects ...
Thursday, February 3, 2011 at 5:06pm by Jack

Chemistry
a. Calculate the delta H, delta G, and equilibrium constant for the reaction of methane with Cl2 to give CH3Cl and HCl. Use the following information for your calculations: Bond Dissociation Energies: CH3-H (104.8kcal/mol), Cl-Cl(59.0 kcal/mol), CH3-Cl(85.0 kcal/mol), and H-Cl...
Sunday, October 30, 2011 at 6:19pm by Jennifer

chemistry
carbon dioxide dissolves in water to form carbonic acid. Estimate the thermodynamic equilibrium constanst (K) for this reaction (delta Gf values: H2CO3= - 616.1, H2O= - 237.1, CO2= - 394.4) . Carbonic acid then ionizes in water (Ka1= 4.5 x 10^-7). Ignoring Ka2, estimate (K) ...
Saturday, April 7, 2012 at 6:15pm by Mima

College Physics
Which one of the following statements about a thermodynamic engine is not true, i.e., which one of the statements is false? 1)The internal energy is always the same at the beginning and at the end of one cycle. 2)The absorbed and the exhausted heat have the same magnitude. 3)...
Monday, November 22, 2010 at 4:12pm by Tracy

6 Entropy
Using the thermodynamic data provided below, calculate the standard change in entropy when one mole of sodium nitrate is dissolved in water? S° (J/K•mol) NaNO3(s) 116.3 Na+(aq) 60.25 NO3–(aq) 146.4 Using the value you calculated, how will the solubility of sodium...
Tuesday, May 3, 2011 at 11:13pm by Nicole

P-Chem
Protein denaturations are usually irreversible but may be reversible under a narrow range of conditions. At pH 2.0, at temperatures ranging from about 40 degrees celcius to 50 degrees celcius, there is an equilibrium between the active form P and the deactivated form D of the ...
Friday, October 20, 2006 at 6:42pm by Angela

chemistry
Nicotine is not only bad for you (ahem!), but it also acts as a base in aqueous solution: Kb = 7x10-7 at 298K. i) Find G per mol of nicotine acting as a base in aqueous solution at 298K. ii) Find the pH of the solution if the initial [nicotine] = 0.80 M. iii) ...
Wednesday, February 11, 2009 at 8:23pm by Tillie

Physical Science
The study of heat and its relation to fluid properties, and the performance of work upon and by fluids, is called thermodynamics. The subject can be taught using two or three laws of thermodynamics, without dealing with kinetic theory. The kinetic theory of matter can be used ...
Tuesday, April 27, 2010 at 1:30pm by drwls

Thermodynamic Physics
When a driver brakes an automobile, friction between the brake disks and the brake pads converts part of the car's translational kinetic energy to internal energy. If a 1500 kg automobile traveling at 42 m/s comes to a halt after its brakes are applied, how much can the ...
Sunday, January 13, 2013 at 10:25pm by Kristal

Chemistry
When the oxide of generic metal M is heated at 25.0 °C, only a negligible amount of M is produced. O2M(s) ----> M(s) +O2(g) delta G= 288.9 Kj/mol When this reaction is coupled to the conversion of graphite to carbon dioxide, it becomes spontaneous. What is the ...
Wednesday, March 14, 2012 at 11:51pm by Jerry

chem
Which of the following is NOT true about the thermodynamic standard state? A. A gas is in its standard state when its pressure is 1.00 atm and its temperature is 25C. B. An aqueous solution is in its standard state at a concentration of 1.00 M. C. A pure liquid is in its ...
Sunday, February 24, 2008 at 8:13pm by Anonymous

Chemistry
Which of the following is NOT true about the thermodynamic standard state? A. A gas is in its standard state when its pressure is 1.00 atm and its temperature is 25C. B. An aqueous solution is in its standard state at a concentration of 1.00 M. C. A pure liquid is in its ...
Sunday, February 24, 2008 at 7:50pm by Anonymous

CHEMISTRY
1.Calculate the enthalpy change (ΔHºrxn) for the following reaction: (The enthalpy of formation of aqueous sodium hydroxide is -469.60 kJ/mol. The enthalpy of formation of liquid water is -285.8 kJ/mol.) 2Na (s) + 2H2O (l) → 2NaOH (aq) + H2 (g) 2.Do you...
Friday, December 16, 2011 at 9:05am by Cha-Ching

CHEMISTRY!! NEED IMMEDIATE HELP PLEASE!!!
a. Calculate the delta H, delta G, and equilibrium constant for the reaction of methane with Cl2 to give CH3Cl and HCl. Use the following information for your calculations: Bond Dissociation Energies: CH3-H (104.8kcal/mol), Cl-Cl(59.0 kcal/mol), CH3-Cl(85.0 kcal/mol), and H-Cl...
Sunday, October 30, 2011 at 8:10pm by Natasha

chemistry
Which of the following is NOT true about the thermodynamic standard state? A. A pure liquid is in its standard state at 25C and a vapor pressure of 1.00 atm. B. An aqueous solution is in its standard state at a concentration of 1.00 M. C. A gas is in its standard state when ...
Sunday, May 17, 2009 at 6:21pm by jeff

Chemsitry
Which of the following is NOT true about the thermodynamic standard state? A. A solid is in its standard state when the atmospheric pressure is 1.00 atm and the temperature is 25C. B. An aqueous solution is in its standard state at a concentration of 1.00 M. C. A gas is in ...
Monday, February 25, 2008 at 5:31pm by Anonymous

chemistry
Which of the following is NOT true about the thermodynamic standard state? A. A gas is in its standard state when its pressure is 1.00 atm and its temperature is 25C . B. An aqueous solution is in its standard state at a concentration of 1.00 M. C. A solid is in its standard ...
Wednesday, February 20, 2008 at 1:52pm by jina

Chemistry
Which of the following is NOT true about the thermodynamic standard state? A. A solid is in its standard state when the atmospheric pressure is 1.00 atm and the temperature is 25C. B. A pure liquid is in its standard state at 25C and a vapor pressure of 1.00 atm. C. An ...
Saturday, May 17, 2008 at 8:09pm by Tom

CHEMISTRY> HELP QUICK! pls
Use the following thermodynamic data at 298 K to determine the equilibrium constant at this temperature for the reaction of iron in steam to form hydrogen and iron(III) oxide. 2Fe(s) + 3H2O(g) 3H2(g) + Fe2O3(s) Substance Fe(s) H2O(g) H2(g) Fe2O3(s) ÄH°f (kJ/mol) 0 -...
Sunday, September 5, 2010 at 2:58am by Lucinda

Chemistry
So I have had several homework problem like this and managed to solve them easily, but these two problems I cannot get the correct answer for. Using a Table of thermodynamic data, calculate the change in Gibbs free energy for each of the following reactions. In each case ...
Thursday, February 17, 2011 at 12:06am by Don

chem
Please don't change your screen name when posting different questions. It gets us confused. This is a limiting reagent problem as well as a thermodynamic one. First, determine the limiting reagent. I didn't work through all of the problem but I think the limiting ...
Friday, October 3, 2008 at 11:58pm by DrBob222

chemistry
Steve, in an attempt to impress his girlfriend, plops 18.2 grams of sodium metal into 500 mL of concentrated phosphoric acid (density = 1.88 g/cm3) in a beaker. The reactants were both initially at 25 oC. The reaction gently produced bubbles of hydrogen and Janet was not ...
Sunday, December 9, 2012 at 6:24pm by Veronica

Chemis
Steve, in an attempt to impress his girlfriend, plops 18.2 grams of sodium metal into 500 mL of concentrated phosphoric acid (density = 1.88 g/cm3) in a beaker. The reactants were both initially at 25 oC. The reaction gently produced bubbles of hydrogen and Janet was not ...
Sunday, December 9, 2012 at 6:24pm by Veronica

chem
For the gaseous equilibrium represented below, it is observed that greater amounts of PCl3 and Cl2 are produced as the temperature is increased. PCl5(g) <===> PCl3(g) + Cl2(g) a) What is the sign of S° for the reaction? Explain. b) What change, if any, will ...
Tuesday, April 29, 2008 at 11:43am by Luke

chem!
Calculate the heat of reaction for the incomplete combustion of 67.0g propane producing carbon monoxide gas and water vapour. how would I go about and do this question? What are you studying? Do you know how to use the thermodynamic tables (delta Ho, etc). delta Hrxn = delta ...
Monday, May 14, 2007 at 4:06pm by Chem

Thermodynamic
During a spontaneous chemical reaction, it is found that δSsys < 0. This means __________ a. δSsurr < 0 and its magnitude is < δSsys. b. δSsurr < 0 and its magnitude is > δSsys. c. δSsurr...
Friday, March 22, 2013 at 9:28pm by Flavia

Chemistry!
When 2.5g of NaOH were dissolved in 49.0g water in a calorimeter at 24.0 C, the temperature of the solution went up to 37.1 C. a. Is the solution reaction exothermic? Why? The temperature or the water went from 24.0 to 37.1 which is an increase. If the solution of NaOH in ...
Monday, December 4, 2006 at 1:30am by DrBob222

biology
What connections can you identify between the metric units for length and volume length x length x length = cubic length. That is cm x cm x cm = cubic centimeters or m x m x m = cubic meters. That is length used to measure the sides will provide a volume. That is why volume ...
Monday, September 25, 2006 at 10:25pm by wow

physics
I have tried the ideal gas law to find the temp and Pressure so that i could then find the work but i am not getting the right answer in the end. any suggestions? 3.1 One kilogram of air in a piston-cylinder device undegoes a thermodynamic cycle composed of the following ...
Monday, June 18, 2007 at 2:20pm by jody

Chemistry
2 H2S (g) + SO2 (g) <===> ƒnƒn3 S (s) + 2 H2O (g) 1) At 298 K, the standard enthalpy change, H¢X, for the reaction represented below is -145 kilojoules. (a) Predict the sign of the standard entropy change, S¢X, for the reaction. Explain the ...
Tuesday, April 29, 2008 at 11:42am by JJ

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