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April 19, 2014

Search: Chem/ Calculating Lattice Energy, Vapor Pressure

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Chem/ Calculating Lattice Energy, Vapor Pressure
How do you calculate lattice energy? I have to place the following in order of decreasing magnitude of lattice energy, but I don't know how to do it. KF MgS RbI Is there a formula or some simple way of knowing which has the greatest energy? 2. I also have the same question, ...
Thursday, December 6, 2012 at 5:11am by Danya

Chem/ Calculating Lattice Energy, Vapor Pressure
For 1, the smaller the ions the greater the lattice energy so RbI would be lowest and KF the highest (of those two). Mg and S are divalent and the attractive forces are higher than for monovalent cations and anions. So MgS I would expect to be the highest of the three.
Thursday, December 6, 2012 at 5:11am by DrBob222

Chem/ Calculating Lattice Energy, Vapor Pressure
For 2, the boiling point are NH3 = -33 NF3 = -129 BCl3 = 12.5 You would expect vapor pressure to track (in reverse) the boiling point; i.e., higher b.p. gives lower v.p. BCl3 has the highest molar mass and the IM forces are greatest; therefore b.p. is highest and vapor ...
Thursday, December 6, 2012 at 5:11am by DrBob222

Chem
The boiling point is defined as the temperature at which the vapor pressure of the liquid equals the atmospheric pressure. So as the pressure is increased, the vapor pressure must be higher if pressure is higher and how do we get a higher vapor pressure. Lower T or higher T?
Wednesday, February 23, 2011 at 11:02pm by DrBob222

chem
You find the line that divides liquid/gas. At T = 179 you should find the vapor pressure (on the pressure axis) = 1 atm or 760 mm Hg. So read the vapor pressure from that vapor/liquid line at 125. That should be the vapor pressure at that temperature.
Friday, February 12, 2010 at 7:36pm by DrBob222

Chem II
What is the vapor pressure at 23 degrees C of a solution of 1.20 g of naphthalene, C10H8, in 25.6 g of benzene, C6H6? The vapor pressure of pure benzene at 23 degrees C is 86.0 mmHg; the vapor pressure of naphthalene can be neglected. Calcluate the vapor pressure lowering of ...
Thursday, February 14, 2008 at 2:30pm by Ken

Chemistry
Which of the following statements is (are) true? A. The vapor pressure of CO2 is lower than the vapor pressure of water. B. Sea water has a lower vapor pressure than distilled water. C. The vapor pressure of 1 m NaCl is higher than the vapor pressure of 0.5 m KNO3, assuming ...
Monday, August 30, 2010 at 8:07pm by kendra

chem
If the total pressure is 752 mm Hg, that is the pressure of the H2 gas + the pressure of the water. So look up the vapor pressure of water at 25 degrees C (at moderate temperatures I remember that the vapor pressure of water is approximately the samae as the T reading in C---...
Sunday, May 11, 2008 at 8:15pm by DrBob222

Chemistry
In melting a solid the crystal lattice is broken down and the molecules that were in a fixed position are free to move around. Evaporation takes it one step further. As molecules gain more energy in the liquid state (from heating, the sun, normal vapor pressure, etc), the more...
Wednesday, May 19, 2010 at 2:14pm by DrBob222

CHEM
Vapor pressure is the pressure exerted by a vapor when condensation: A. < B. = C. > evaporation over its liquid in a closed system.
Sunday, February 1, 2009 at 4:40pm by joey

Calculating Vapor Pressure
The vapor pressure of nitrogen at several different temperatures is shown below. Temperature (K) Pressure (Torr) 65 130.5 70 289.5 75 570.8 80 1028 85 1718 1. Use the data to determine the heat of vaporization of nitrogen in kJ/mol. 2.Determine the normal boiling point of ...
Sunday, January 17, 2010 at 11:53am by Kyle

chemistry
For ionic compounds, the lattice energy varies with distance between centers of the ions as well as on the charge of the ions. The higher charge has the higher lattice energy and the smaller ions have higher lattice energy than large ions. Therefore, the CaO is +2 and -2 ...
Thursday, March 3, 2011 at 2:23pm by DrBob222

AP Chem
The vapor pressure of diethyl ether C2H5OC2H5 is greater than the vapor pressure of ethyl alcohol, C2H5OH at any temperature. Which best accounts for this difference?
Wednesday, January 23, 2013 at 12:01am by Anonymous

Chem, could someone cheak my work please.
Ok, for 3) you need the volume of butane you measured, and the pressure of that butane. The pressure of the butane is atmospheric minus water vapor pressure (there is water vapor in there). You get the water vapor pressure from a water vapor pressure table, knowing the ...
Friday, December 12, 2008 at 2:31am by bobpursley

Chem help
Here is a site that give you some insight on lattice energy. http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch7/lattice.html Yes, paramegnetic species will be those that have unpaired electrons. s and p.
Wednesday, November 28, 2007 at 1:01pm by DrBob222

vapor pressure
Vapor pressure is the pressure exerted by a vapor when condensation (<,>, or =) evaporation over its liquid in a closed system = =
Wednesday, January 17, 2007 at 8:43pm by yayhawknelson

Vapor pressure of liquids
benzaldehyde has a normal boiling point of 179 C and a critical point at 422C and 45.9 atm. estimate its vapor pressure at 139C.
Tuesday, January 25, 2011 at 2:51am by Chem 2011

Chem again sorry
A solution of sodium chloride in water has a vapor pressure of 18.3 torr at 25C. What is the mole fraction of NaCl in this solution? __________ What would be the vapor pressure of this solution at 45C? The vapor pressure of pure water is 23.8 torr at 25C and 71.9 torr at 45...
Sunday, November 30, 2008 at 12:06am by Dina

chemistry
What is the vapor pressure at 23 C of a solution of 1.20 g of naphthalene, C10H8, in 25.6 g of benzene, C6H6? The vapor pressure of pure benzene at 23 C is 86.0 mmHg; the vapor pressure of naphthalene can be neglected. Calculate the vapor pressure lowering of the solution.
Monday, April 15, 2013 at 11:33am by george

Calculating Vapor Pressure
1) 5.92 kj/mol
Sunday, January 17, 2010 at 11:53am by Susan

chemistry
1.Vapor pressure is the pressure exerted by a vapor when condensation A. < B. = C. > evaporation over its liquid in a closed system. 2.Evaporation is an A. endothermic B. exothermic process, because when a substance evaporates it must A. absorb B. release energy to(from...
Monday, January 25, 2010 at 11:01pm by bubble

Chemistry
What is the vapor pressure of a solution composed of 3.0 moles benzene (vapor pressure 12.1 kPa) & 1 mole chloroform (vapor pressure 25.2 kPa)
Tuesday, January 15, 2008 at 9:35pm by Anonymous

College chemistry
-22C is well below the boiling point. Only a small amount will be present as vapor. You can estimate that amount using the Clausius-Clapeyron equation and the 1 atm vapor pressure at -0.4 C. You can also use the C-C equation for the vapor pressure at the higher temperature, 25...
Saturday, January 23, 2010 at 12:31pm by drwls

Chemistry
Anonymous, that is nonsense. It sounds like someones dream of a new gadget for distilling that has never been built. Alcohol molecues are not held with intermolecular forces strong as water to water, so when energy is added (heat), the alcohol is the first to break free of ...
Thursday, October 30, 2008 at 8:10pm by bobpursley

College Chemistry
The boiling point of a liquid at atmospheric pressure is the temperature: a. at which bubbles of vapor expand within the liqud b. at which the liquid solidifies c. at which the vapor pressure first exceeds the critical temperature d. at which the vapor pressure is equal to the...
Sunday, March 28, 2010 at 3:50pm by Donna

Chemistry
Because the vapor pressure of C2H5OH is 760 mm at 78 degrees C. And because the vapor pressure of H2O is 760 mm at 100 degrees C. The definition of boiling point is that temperature at which the vapor pressure of the liquid equals atmospheric pressure.
Tuesday, January 29, 2008 at 9:17pm by DrBob222

Chem.
Note the correct spelling of celsius. Use the Clausius-Clapeyron equation. One of the points is the normal boiling point (where the vapor pressure is 760 torr) and the other point is vapor pressure at 18 C. Don't forget to use Kelvin for temperature.
Wednesday, February 10, 2010 at 3:49am by DrBob222

College Chemistry
Of KCl and NaCl, which has a higher lattice energy? What is lattice energy? Lost. Please help.
Sunday, October 24, 2010 at 7:15pm by Sally

Lattice Energy
Arrange the following substances in order of decreasing magnitude of lattice energy. KCl NaF SrO BaO
Saturday, December 5, 2009 at 2:55pm by Kyle

AP Chem
First, get the water vapor pressure at 26C. Subtract that water partial pressure from the pressure in the tube, and you have the pressure of H2, you are given the temp, and the volume. use n=PV/RT to get moles.
Tuesday, November 4, 2008 at 7:44pm by bobpursley

Chem 2
Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 12.5 g of biphenyl in 27.9 g of benzene?
Saturday, July 14, 2012 at 5:28pm by Payie

Chemistry
1) What is the vapor pressure at 25C of a solution of 1.20g ofnephtalene C10H8 in 25.6g of benzone C6H6? The vapor pressure of pure benzene at 23C is 86.0mmHg the vapor pressure of naphthalene can be neglected. Calculate the vapor pressure lowering of the solution. 2)A ...
Tuesday, March 19, 2013 at 11:30pm by N comas

CHEMISTRY
1. What is the vapor pressure at 25C of a solution of 1.20g of nephtalene C10H8 in 25.6g of benzone C6H6? The vapor pressure of pure benzene at 23C is 86.0mmHg the vapor pressure of naphthalene can be neglected. Calculate the vapor pressure lowering of the solution. 2. A ...
Wednesday, March 20, 2013 at 12:14am by N COMAS

Chemistry
What is the vapor pressure at 23 degree C of a solution of 1.20g of naphthalene, C10H8 in 25.6 g of benzene, C6H6? The vapor pressure of naphthalene can be neglected. Calculate the vapor-pressure lowering the solution
Thursday, February 7, 2008 at 9:24pm by Lauren

chemistry
I am not certain if I understand the question. vapor pressure indicates the tendency for molecules to move to the vapor state. If forces bind the molecules together, bp will be highter, and for a given temperature, vapor pressure is lower. If forces disperse molecules, bp is ...
Monday, May 20, 2013 at 9:53pm by bobpursley

Chemistry
you need to find the pressure for water vapor for certain temperatures. this is given in a table and have been calculated for you. use the dalton's law of Partial pressure. i.e. the Pressure for the dry gas equals the Total pressure of the system - the pressure of water vapor ...
Saturday, May 11, 2013 at 3:27pm by bonjo

General Chemistry
If the intermolecular force is greater the vapor pressure will be less because the molecules must have more kinetic energy to escape as a vapor.
Wednesday, February 5, 2014 at 9:15pm by DrBob222

chem
A 4.1 L sealed bottle containing 0.25 g of liquid ethanol, C2H6O, is placed in a refrigerator and reaches equilibrium with its vapor at -11C. The vapor pressure of ethanol is 10 torr at -2.3C and 40 torr at 19C. (a) What mass of ethanol is present in the vapor?
Sunday, November 14, 2010 at 9:23pm by Anonymous

chem
The solvent for an organic reaction is prepared by mixing 50.0 of acetone () with 57.0 of ethyl acetate (). This mixture is stored at 25.0 . The vapor pressure and the densities for the two pure components at 25.0 are given in the following table. What is the vapor pressure of...
Saturday, February 5, 2011 at 7:18pm by Anonymous

Chem
did you subtract the vapor pressure of water at 25C from the pressure?
Sunday, November 16, 2008 at 5:39pm by bobpursley

Chemistry
Total pressure is 750 mm Hg. Total pressure = pressure H2 + pressure water vapor. Look up the vapor pressure of water at 22 C.
Friday, February 19, 2010 at 12:12am by DrBob222

college chem
Biphenyl, C12H10, is a nonvolatile, non ionizing solute that is soluble in benzene, C6H6. At 25 C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 14.3 g of biphenyl in 25.8 g of benzene?
Saturday, February 9, 2013 at 5:42pm by Zachary

chem
consider a mixture of air and gasoline vapor in a piston. original V is 30cm^3. if the combustion of misture releases 985J energy, to what volume will the gases expand against a constant pressure of 655 torr if all energy of combustion is converted into work ro push back the ...
Tuesday, November 20, 2007 at 5:13pm by mel

Chemistry
Look up the vapor pressure of H2O at various temperatuares. I assume you have a table in your text/notes; otherwise, you can look on the web. Look for a vapor pressure of 520 mm and the temperature that produces that will be the boiling point. WHY? Because boiling point is ...
Tuesday, October 4, 2011 at 3:50pm by DrBob222

Chem
The total pressure in a vessel containing hydrogen collected over water at 25.0C was 0.8 atm. The vapor pressure of water at that temperature is 23.8. what was he pressure of the oxygen in torr?
Friday, February 22, 2013 at 11:37pm by Lupe

Chemistry....help
find the water vapor pressure from the temperature, and subtract that pressure from your observed pressure. At 25C, water vapor pressure is 23.8 mmHg (check that) so your observed pressure then was 757.5mmHg-23.8mmHg. Now, you have pressure and volume at that pressure, convert...
Tuesday, July 3, 2012 at 9:19am by bobpursley

chemistry
A bottle of rubbing alcohol (C3H7OH) from the store is a 70% solution by mass. Determine the total vapor pressure inside the closed bottle. The vapor pressure of the water at room temperature is 24mmHg; the vapor pressure of the volatile rubbing alcohol is 44mmHg.
Thursday, April 17, 2008 at 5:04pm by billy bob j

Gen Chem
A liquid is heated from 33.96C to 104.32C. The vapor pressure increases from 23.54torr to 984.35torr. What is the heat of vaporization of the liquid in kJ/mol? The change in temperature is 70.36C. Change in vapor pressure = 960.76 torr. What is the equation to find the heat...
Friday, March 28, 2008 at 7:08pm by Sarah H

Chem
If you use PV = nRT, plug in 856 torr for pressure (the vapor pressure of the liquid will be the pressure in the container if there is some liquid remaining) and solve for n. Convert n to grams and subtract from 11.5
Saturday, February 13, 2010 at 9:34pm by DrBob222

Chemistry
The estimated lattice energy for is CsF2+2347kj/mol. Use the data given to calculate an overall energy change (in kilojoules per mole) for the formation of from its elements. Ea for F = -328 E11 forCs = +375.7 E12 for Cs = +2422 Heat of sublimation for Cs = 76.1 Bond ...
Tuesday, November 9, 2010 at 8:49pm by diane

chemistry
Calculate the vapor pressure lowering of water when 5.67 g of glucose, C6H12O6, is dissolved in 25.2 g of water at 25 C. The vapor pressure of water at 25 C is 23.8 mmHg. What is the vapor pressure of the solution?
Thursday, March 29, 2012 at 5:51pm by MJ

Science
The bonds between ions of opposite charge is strongest when the ions are small, the lattice energy of LiF is more exothermic than the lattice energy of CsI. Explain.
Friday, March 23, 2012 at 12:07am by Godswill

Chemistry...
Total pressure= sum of the partial pressures 762 torr-water vapor pressure=O2 pressure water vapor pressure at 25C =23.756 torr But check the reference value.
Wednesday, February 20, 2013 at 7:11pm by Devron

chemistry
Methanol boils at 65Celcius. The vapor pressure of ethanol at 65Celcius is at 410 torr. for a mixture containing .200 mol of methanol and .100 mol of ethanlol (at 65 Celcius) calculate the: 1. partial pressure of each liquid 2. total vapor pressure of the solution 3. percent ...
Sunday, October 25, 2009 at 12:12pm by Cerise

Chemistry
Butanone, CH3CH2COCH3, has a vapor pressure of 100. Torr at 25C; at the same temperature, propanone, CH3COCH3, has a vapor pressure of 222 Torr. What mass of propanone must be mixed with 322.0 g of butanone to give a solution with a vapor pressure of 135 Torr? Assume ideal ...
Wednesday, February 10, 2010 at 3:29am by Cairy

chemistry
Look up the vapor pressure of water at 35 degrees celsius (note the correct spelling of celsius) and add it to the pressure of N2 gas. Probably the water pressure will be listed in mm Hg and you must convert either N2 pressure or vapor pressure H2O before adding.
Friday, April 9, 2010 at 7:05pm by DrBob222

Chemistry
I don't have Table 5.2 but I assume that is vapor pressure of water. Total pressure (752 torr) = Partial pressure H2 + partial pressure of H2O. Look in the table at 16 C and pick up the vapor pressure of water (partial pressure of water), subtract that from 752 to find the ...
Monday, October 18, 2010 at 5:18pm by DrBob222

Chemistry
The boiling point of a solvent is the temperature at which the vapor pressure of the solvent equals atmospheric pressure (the pressure surrounding the solvent in the case of a capped flask). So, a boiling solution means the vapor pressure = 760 mm Hg if the atmospheric ...
Monday, April 11, 2011 at 3:13pm by DrBob222

Chemistry
You need a vapor pressure curve for hexane versus T. Set pressure so vapor pressure at 22-25 C is equal to or greater than boiling point hexane.
Tuesday, August 30, 2011 at 5:50pm by DrBob222

chemistry - vapor pressure
the vapor pressure of pure water at 25C is 23.8 torr. determine the vapor pressure (torr) of water at 25 C above a solution prepared by dissolving 35g of urea (a nonvolatile, non-electrolyte, MW = 60.0G/MOL) IN 76G of water. answer:21 i just want to know the steps bc im ...
Monday, September 13, 2010 at 10:47pm by billy

Chemistry
The vapor pressure of water at 25C is 23.76 mm Hg. What would you calculate as the new vapor pressure of a solution made by adding 50.5 g of ethylene glycol (HOCH2CH2OH, antifreeze) to 50.5 g of water? You may assume that the vapor pressure of ethylene glycol at this ...
Wednesday, January 26, 2011 at 2:46pm by Rukky

chem
A 1L flask is filled with 1.25 g of argon at 25 degrees celcium. A sample of ethane vapor is added to the same flask until the total pressure is 1.45 atm. What is the partial pressure of argon in the flask? Chemistry - DrBob222, Tuesday, October 5, 2010 at 9:00pm mols Ar = 1....
Thursday, October 24, 2013 at 6:21pm by kris

thermodynamics
(A) Since the water vapor and water are at equilibrium, the water vapor pressure is a function of the temperature (and vice versa). 5.00*10^5 N/m^2 is 4.94 atm. The temperature at that water vapor pressure is 151.8 C. You can obtain that from tables of H2O saturation pressure ...
Saturday, January 8, 2011 at 5:00pm by drwls

Chem.
Use the Clausius-Clapeyron equation. ln(P2/P1) = -dHvap/R * (1/T2- 1/T1) At the normal boiling point T1, the vapor pressure P1 is 760 torr. A lower temperature T2 will lower the vapor pressure to 440 torr.
Wednesday, February 10, 2010 at 3:51am by drwls

Science
Drying is caused by the fact that water has a vapor pressure. Drying clothes is the same as leaving a spot of water on the dinner table. The spot of water will dry because the water evaporates. The water evaporates because of the vapor pressure of water. Water in clothes has ...
Sunday, November 2, 2008 at 7:15pm by DrBob222

chemistry
An Ideal solution is formed by mixing 0.26 mol of pentane (vapor pressure + 511 torr) with 0.34 mol of hexane (vapor pressure = 150 torr). What is the total vapor pressure of the ideal solution?
Thursday, March 6, 2014 at 4:59pm by Anonymous

Physics
You compress air saturated with water vapor at 24C and atmospheric pressure (101.325 kPa) until the total pressure is doubled and the temperature is 36C. What is the final pressure of the water vapor?
Tuesday, September 13, 2011 at 9:14pm by Melissa

Chemistry
Based on what you told me (I've not performed this experiment), PV = nRT so R = (PV)/nT If you did not correct the pressure you read for the room for the vapor pressure of water (don't you usually subtract the vapor pressure of water to obtain the partial pressure of the dry ...
Thursday, January 21, 2010 at 4:34pm by DrBob222

science - chemistry
Some heat is supplied to a mixture of ice and liquid water in a closed container and the contents of the container are thoroughly mixed. If, after the addition of heat, both ice and liquid water remain: A) the temperature of the system will increase B) the vapor pressure will ...
Monday, December 27, 2010 at 12:43am by S

PLEASE HELP! PHYSICAL CHEM
The measured osmotic pressure of seawater is 25 atm at 273K. a.) What is the activity of water in seawater at 273 K? Take the partial molar volume of water in seawater to be 0.018 M-1. b.) The vapor pressure of pure water at 273 K is 4.6 torr. What is the vapor pressure of ...
Saturday, October 14, 2006 at 5:31am by Amy

AP CHEM-URGENT PLEASE
I think you stated the problem incorrectly. Do you want the temperature at which the VAPOR PRESSURES are equal? If so, then yes, you do use the Clausius Clapeyron equation. The vapor pressure will be proportional to e(-Hv/RT), where Hv is the heat of vaporization
Thursday, January 24, 2008 at 3:24am by drwls

chemistry
the lattice energy for MgCl2 is -2326 kj/mol, which is much higher than that for NaCl which has a lattice energy of -786 kj/mol. Why is this so? Give at least two contributing factors.
Thursday, April 3, 2014 at 6:38pm by Mai

AP Chem
You're right. The secret words are OVER WATER. Perhaps we should have subtracted the vapor pressure of water in the NaHCO3 problem, too, but I didn't when I worked that problem. I suppose, when we have a problem like the NaHCO3 problem, when it asks for the volume of CO2 ...
Wednesday, November 19, 2008 at 2:01pm by DrBob222

heat of vapor pressure
When a student plotted ln [vapor pressure of a gas] vs. inverse Kelvin temperature, she obtained a straight line with a slope equal to -9500 K. According to the Clausius Clapeyron equation, Hvap is ? kJ/mol. The vapor pressure is proportional to exp (-Hv/RT), with a constant ...
Thursday, January 18, 2007 at 1:15am by yayhawknelson

Chemistry 2
An aqueous solution has a vapor pressure of 81.1 at 50 . The vapor pressure of pure water at this temperature is 92.6. What is the concentration of in mass percent?
Thursday, January 27, 2011 at 9:42pm by Jesse

chem
A 2.30 L sample of O2(g) was collected over a liquid at a total pressure of 785 torr and 25C. When the O2(g) was dried (vapor of that liquid removed), the gas had a volume of 1.93 L at 25C and 785 torr. Calculate the vapor pressure of this liquid at 25C.
Thursday, November 3, 2011 at 4:11pm by Anonymous

chem!!
what determines if the heat of solution is endothermic or exothermic for salts? Mostly the competition between the lattice energy (how much energy it takes to break the crystalline strucure) vs the heat of solvation of the ions.
Wednesday, April 25, 2007 at 8:20pm by Anonymous

Physical chemistry
Estimate the vapor pressure of sea water at 20C given that the vapor pressure of pure water is 2.338 kPa at that temperature and the solute is largely Na+ and Cl- ions, each present in about .50 mol/dm^3. I'm pretty sure the formula to use is pj=xjpj'. Where pj' is the vapor ...
Thursday, September 30, 2010 at 8:27pm by Melissa

Chemistry
A solution of NaCl in water has a vapor pressure of 18.1 torr at 25 degrees C. What is the mole fraction of NaCl solute particles in this solution? What is vapor pressure at 45 degrees C? Vapor pressure of pure water is 23.8 torr at 25C and 71.9 torr at 45C, assume ions are Na...
Sunday, March 7, 2010 at 9:22pm by Sara

Chemistry
How do I find the total vapor pressure of a solution of benzene (mole fraction 0.350, vapor pressure at 25 degrees = 12.7 kPa) in toluene at 25 degrees. (vapor pressure of toluene at 25 degrees = 3.79 kPa)
Wednesday, December 19, 2007 at 5:43am by Jaden

Chemistry
If your partner did not take into account the vapor pressure of water when calculating the moles of hydrogen produced, would the mass of Mg that was calculated at the end of the experiment be too high or too low? Why?
Monday, April 8, 2013 at 11:56am by Kate

Chemistry
We don't have table 5.2. Water at 20C has a vapor pressure of 17.4 mm Hg. R.H. = vapor pressure/17.4 so you can use that to calculate pressure and use PV = nRT to determine the moles H2O. I assume table 5.2 will give you the vapor pressure of water at 0C. Use that pressure and...
Wednesday, January 26, 2011 at 11:16pm by DrBob222

CHEM
Calculate the vapor pressure at 25 C of hexane above the solution. The vapor pressure of pure hexane at 25 C is 151 torr. A solution contains naphthalene ({\rm{C}}_{10} {\rm{H}}_8) dissolved in hexane ({\rm{C}}_6 {\rm{H}}_{14}) at a concentration of 12.17 \% naphthalene by mass.
Saturday, June 5, 2010 at 10:31pm by AMI

chem
Which of the following is NOT true of colligative properties? Colligative properties are... A. responsible for lowering the vapor pressure of a solution versus the vapor pressure of the pure solvent. B. dependent on the mass of solute present. C. independent of the chemical ...
Friday, August 8, 2008 at 3:25pm by sonia

chem lab (webwork)
Which of the following is NOT true of colligative properties? Colligative properties are... A. dependent on the mass of solute present. B. independent of the chemical identity of the solute. C. responsible for lowering the vapor pressure of a solution versus the vapor pressure...
Saturday, April 3, 2010 at 12:02am by UCI studebt

Air conditioning
The partial pressure of water vapor in an atmosphere at 35oC and 740 mm Hg pressure is 37 mm Hg. What is the relative humidity? What is the actual concentration of water vapor, expressed in ppm? The vapor pressure of water at 35oC is 42 mm Hg.
Thursday, March 24, 2011 at 6:43am by althea

Mole fraction of a vapor pressure?
If 0.380 mol of a nonvolatile nonelectrolyte are dissolved in 3.00 mol of water, what is the vapor pressure P(H2O) of the resulting solution? The vapor pressure of pure water is 23.8 torr at 25 C. I got this answer correct: 21.1 torr A solution is composed of 1.50mol ...
Thursday, September 2, 2010 at 3:31pm by Sar

chemistry
the vapor pressure of water at 45.0 c is 71.93 mmhg. Calculate the vapor pressure of a solution of 1.50 m Al(NO3)3 at this temperature (assume 100% dissociation)
Tuesday, July 16, 2013 at 10:51am by michael

CHEM HELP
Which of the following is NOT true of colligative properties? Colligative properties are... a) dependent on the molar mass of the solute. b) dependent on the mass of solute present. c) responsible for lowering the vapor pressure of a solution versus the vapor pressure of the ...
Thursday, April 2, 2009 at 11:55pm by steven

Gen Chemestry
a). Total P = partial pressure chloring + partial pressure water vapor. You know total P and you know parital pressure of water vapor. Solve for partial pressure chlorine. b)I may have missed something but don't they tell you the volume is 27.6 mL? c)Use PV = nRT Post your ...
Saturday, October 25, 2008 at 12:19am by DrBob222

Dr. Bobb222
When you get a chance: If the pure liquid vapor pressure of benzene is 155 torr and the pure liquid vapor pressure of chloroform is 333 torr, then what is the total vapor pressure at 30C of a solution of 9.26 g of benzene (C6H6) and 4.26 g of chloroform (CHCl3)? I get 195torr.
Monday, August 5, 2013 at 4:36am by Devron

Chemistry
XCH2Cl2 = 0.04/total moles. XCH2Br2 = 0.07/total moles. partial pressure CH2Cl2 = XCH2Cl2*133 = ?? partial pressure CH2Br2 = XCH2Br2*11.4 Total pressure = PCH2Cl2 + PCH2Br2 = ?? XCH2Cl2 in vapor = (partial pressure CH2Cl2/total P of vapor) XCH2Br2 in vapor = (partial pressure ...
Sunday, February 20, 2011 at 7:20pm by DrBob222

chemistry
The mole fraction of each component = 0.5 The vapor pressure of the mixture is: P = (0.5)(22) + (0.5)(75) = ____ mm X(benzene vapor) = P(benz. vapor)/P X(benzene vapor) = (0.5)(75)/P
Monday, February 2, 2009 at 12:09am by GK

Chemistry!!!~!!
A solution of sodium chloride in water has a vapor pressure of 18.5 torr at 25C. What is the mole fraction of NaCl in this solution? What would be the vapor pressure of this solution at 48C? The vapor pressure of pure water is 23.8 torr at 25C and 83.7 torr at 48C. I've ...
Monday, April 19, 2010 at 10:35am by Jenn

College Chem
Oxygen gas has a Henry's law constant of 1.66*10^-6 M/mm Hg at 40 degree C when dissolving in water. If the total pressure of gass (O2 gas plus water vapor) over water is 1.0 atm, what is the concentration of O2 in the water in grams per milliliter? Pressure of the water ...
Tuesday, October 15, 2013 at 10:11pm by Kimmy

Chemistry Problem
You need to go through the "cycle" to see this. M(s) ==> M(g) dH = 121 kJ M(g) ==> M^+(g) + e dH = 433 kJ 1/2 X2(g) ==> X(g) dH = 229/2 kJ X(g) + e ==> X^-(g) dH = -313 kJ M^+(g) + X^-(g) ==> MX(s) dH = Ecrystal ----------------------------- Add these. M(g) ...
Saturday, February 2, 2013 at 1:25am by DrBob222

chemistry
the vapor pressure of ethanol at 20c is 44 mmHg and the vapor pressure of methanol at the same temperature is 94mmHg. A mixture of 30.0 g of methanol and 45.0 g of ethanol is prepared (and can be assumed to behave as an ideal solution). a.) calculate the vapor pressure of ...
Monday, January 30, 2012 at 10:37am by cassidy

chemistry
Lattice energy is higher for higher charge on the ions; therefore, you would pick CaO or CaS as higher than LiF and LiI. Then the larger size of the ions decreases lattice energy; therefore, LiI is lower than LiF and CaS should be lower than CaO. I would go with CaO as having ...
Monday, February 18, 2013 at 10:43pm by DrBob222

physics(gas laws)
Yes, when the problem says "dry" you subtract the vapor pressure of water AT THAT TEMPERATURE. How do we get that vapor pressure? We look it up in a table. The vapor pressure of water at 25 degrees C is 23.8 mm Hg. So 760-23.8 is the pressure of the dry gas (the other 23.8 is ...
Sunday, January 27, 2008 at 9:38pm by DrBob222

AP CHEM-URGENT PLEASE
at 25 degrees C liquid A has a vapor pressure of 100.0 torr, while liquid B has a vapor pressure of 200.0 torr. The heat of vaporization of liquid A is 32.0 kJ/mol and that of liquid b is 18.0 kJ/mol. At what celsius temperature will A and B have the same temperature. I haven'...
Thursday, January 24, 2008 at 3:24am by John

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