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September 2, 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, ...
December 6, 2012 by Danya

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 ...
February 14, 2008 by Ken

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 ...
January 17, 2010 by Kyle

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

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?
January 23, 2013 by Anonymous

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 ...
August 30, 2010 by kendra

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...
November 30, 2008 by Dina

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

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...
January 25, 2010 by bubble

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...
February 5, 2011 by Anonymous

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

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.
April 15, 2013 by george

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 ...
March 20, 2013 by N COMAS

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

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 ...
March 19, 2013 by N comas

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 ...
January 18, 2007 by yayhawknelson

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 ...
November 9, 2010 by diane

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?
July 14, 2012 by Payie

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?
February 9, 2013 by Zachary

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?
November 14, 2010 by Anonymous

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...
March 28, 2010 by Donna

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....
October 24, 2013 by kris

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)
January 15, 2008 by Anonymous

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 ...
November 20, 2007 by mel

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.
November 3, 2011 by Anonymous

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.
March 23, 2012 by Godswill

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.
April 3, 2014 by Mai

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.
June 5, 2010 by AMI

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...
March 28, 2008 by Sarah H

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?
February 22, 2013 by Lupe

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?
March 29, 2012 by MJ

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
February 7, 2008 by Lauren

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 ...
September 13, 2010 by billy

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.
March 24, 2011 by althea

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 ...
October 15, 2013 by Kimmy

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.
April 17, 2008 by billy bob j

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 ...
January 26, 2011 by Rukky

Chemistry - Science (Dr. Bob222)
Liquid chloroform (CHCl3) is placed in a closed container and allowed to equilibrate with chloroform vapor. With the temperature held constant, additional chloroform is introduced into the system, and the vapor-liquid equilibrium is reestablished. Following this, the ...
May 10, 2014 by Ana

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.
April 25, 2007 by Anonymous

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 ...
October 25, 2009 by Cerise

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 ...
October 14, 2006 by Amy

vapor pressure
The total pressure in a flask containing air and ethanol at 25.7C is 878 mm Hg. The pressure of the air in the flask at 25.7C is 762 mm Hg. If the flask is immersed in a water bath at 450C, the total pressure is 980 mm Hg. The vapor pressure of ethanol at the new temperature ...
January 18, 2007 by yayhawknelson

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 ...
February 10, 2010 by Cairy

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 ...
September 30, 2010 by Melissa

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'...
January 24, 2008 by John

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 ...
April 19, 2010 by Jenn

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?
September 13, 2011 by Melissa

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?
April 8, 2013 by Kate

chem
i need help while mercury is very useful in barometers, mercury vapor is toxic. given that mercury has Hvapp=56.9kj/mol and its normal boiling point is 356.7C calculate the vapor pressure mm Hg at room temperature, 25c
April 7, 2010 by amy

chem
A sample of oxygen gas was collected via water displacement. Since the oxygen was collected via water displacement, the sample is saturated with water vapor. If the total pressure of the mixture at 26.4 C is 725 torr, what is the partial pressure of oxygen? The vapor pressure...
April 15, 2014 by Natalie

chemistry-lattice energy
Determine the lattice energy for CaBr2 if the enthalpy of solution for CaBr2 is -145 kJ/mol, and the heats of hydration for Ca2+ and Br- are -1650 kJ/mol and -292 kJ/mol respectively.
October 1, 2012 by Bru

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 ...
December 27, 2010 by S

vapor pressure
The total pressure in a flask containing air and ethanol at 25.7C is 878 mm Hg. The pressure of the air in the flask at 25.7C is 762 mm Hg. If the flask is immersed in a water bath at 45.0C , the total pressure is 980 mm Hg. The vapor pressure of ethanol at the new temperature...
January 22, 2007 by yayhawknelson

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)
December 19, 2007 by Jaden

Chemistry
A solution is made by mixing 30.0 mL of ethanol, C2H6O, and 70.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 C? I got an answer of 15.45 torr and it marked me incorrect and said "Your answer is the the partial vapor pressure ...
February 18, 2012 by Lauren

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?
January 27, 2011 by Jesse

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?
March 6, 2014 by Anonymous

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)
July 16, 2013 by michael

chemistry
the vapor pressure of pure water at 60 c is 157 mmHg. what is the vapor pressure of this solution at the same temperature, in mm Hg?
August 25, 2014 by angel

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 ...
August 8, 2008 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...
April 3, 2010 by UCI studebt

chemistry
an organic sbstance has an enthalpy of vaporization of 29.0 kl/mol. the compound has a vapor pressure of524 mm HG at 25 C. at what tempurture is the vapor pressure equal to 115mm HG?
June 12, 2010 by nancy

Chemistry
The vapor pressure of the liquid HF is measured at different temperatures. The following vapor pressure data are obtained. Temperature(K) Pressure mmHg 250 129.63 260 206.65 270 318.22 280 475.16 Determine the enthalpy of vaporization. I have know idea how to start this. Thank...
February 7, 2012 by Hannah

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 ...
April 2, 2009 by steven

CHEM
The vapor pressure of pure water at 25 C is 23.8 torr. Determine the vapor pressure (torr) of water at 25 C above a solution prepared by dissolving 35 g of urea (a nonvolatile, non-electrolyte, MW = 60.0 g/mol) in 75 g of water. where have i made a mistake? 35g/60=0.583 75g/...
September 16, 2010 by BEN

meteorolgy
If the relative humidity is 66% and the vapor pressure is 16 mb, what is the vapor pressure at saturation? Answer: _________ mb (Round to one decimal place, do not include units.)
June 15, 2011 by Anonymous

chem
The total pressure in a flask containing air and ethanol at 257C is 800 mm Hg. If the pressure of the air in the flask is 762 mm Hg, the vapor pressure of ethanol is? I tried doing a relationship of P1 over t1 etc but i dont get the right answer.
April 28, 2008 by Anonymous

Chemistry
The vapor pressure of an unknown substance is given at various temperatures. properties of the substance are: density of solid=1.375g/ml density of liquid= 1.150g/ml. freezing point= 275.0K boiling point=375.0 K How would i calculate the vapor pressure at 150.0K measured at ...
February 7, 2012 by Gifty Ansah

chem - dry ice activity
why does the dry ice form clouds of white vapor, especially when you blow on it? what is the vapor composed of? The vapor is water vapor, condensed, as a fog.
April 22, 2007 by janis

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 ...
September 2, 2010 by Sar

College Chemistry
A sample of octane in equilibrium with its vapor in a closed 1.0 L container has a vapor pressure of 50 torr at 45oC. The containers volume is increased to 2.0 L at constant temperature and equilibrium is re-established. What is the vapor pressure? The answer I got was 25 ...
November 19, 2010 by Mollie

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.
August 5, 2013 by Devron

chem
A sample of O2 gas was collected over water at 23C and 711 torr. What is the partial pressure of the O2? (The vapor pressure of water at 23C is 21.2 torr.) Partial pressure of O2:_____torr
April 18, 2011 by jan

Chemistry: Raoult's Law
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 ...
September 2, 2010 by Sar

meteorolgy
Compute the relative humidity (RH) to nearest percent for each of the following atmospheric conditions: (Round to one decimal place, do not include units.) b. vapor pressure = 4 mb, saturation vapor pressure = 16 mb, RH = _________%
June 15, 2011 by Anonymous

chem
The total pressure in a flask containing air and ethanol at 257C is 845 mm Hg. If the pressure of the air in the flask is 762 mm Hg, the vapor pressure of ethanol is ? mm Hg.
January 31, 2008 by matt

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...
March 7, 2010 by Sara

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 ...
January 30, 2012 by cassidy

Chem help
I have the answers for these but can you please explain to me how to get them? Thanks. Place the following in order of decreasing lattice energy. KBr RbI MgS a. KBr > RbI > MgS b. KBr > MgS > RbI c. RbI > KBr > MgS d. MgS > KBr > RbI e. MgS > RbI >...
November 28, 2007 by Sami

Chemistry
Explain what happens when you add sodium chloride to boiling water. I know that when sodium chloride is added to water, the boiling point of water increases. What happens when it is added to already boiling water? I know it increases the temperature, I just don't know why... I...
January 31, 2007 by Mercedes

Chemistry
A sample of O2(g) is saturated with water vapor at 27 C. The total pressure of the mixture is 772 torr, and the vapor pressure of water is 26.7 torr at 27 C. What is the partial pressure of the O2?
March 15, 2011 by naseeb

vapor and osmotic pressure
A solution of the sugar mannitol ( molar mass 182.2 g/mol ) is prepared by adding 54.66 g of mannitol to 1.000 kg of water. The vapor pressure of pure liquid water is 17.54 torr at 20o C. Mannitol is nonvolatile and does not ionize in aqueous solution. a.) Assuming that ...
October 12, 2006 by Amy

CHEMISTRY
if a pure liquid in a sealed container is in equilibrium with its own vapor, the dependence of the vapor pressure on the temperature and the heat of vaporization is governed by the Clausius-Clapeyron equation. what is the heat of vaporization if the vapor pressure of liquid ...
December 10, 2012 by tre

chem
Complete the table below: Answer the following for a body centered unit cell. (Hint: Helpful information can be found by going to the "Lattice" menu, choosing "Cubic", and then choosing "Body-Centered" in the Crystalline Solids program.) Crystalline Solids Program Answers ...
February 21, 2011 by brian

chemistry(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 -20000 K. According to the Clausius Clapeyron equation, (triangle)Hvap is ? kJ/mol
April 24, 2008 by Leah

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.
January 25, 2011 by Chem 2011

chem
Cydohexanol has a vapor pressure of 10mHg at 56C and 100mmHg at 103.7C. Calculate its enthalpy of vaporization.
January 18, 2011 by lennie

Chem 130
A sample of oxygen gas is collected by displacement of water at 25C and 1.11 atm total pressure. If the vapor pressure of water is 23.756 mm Hg at 25C, what is the partial pressure of the oxygen gas in the sample?
May 5, 2014 by michelle

Chemistry
An aqueous CaCl_2 solution has a vapor pressure of 82.1mmHg at 50C. The vapor pressure of pure water at this temperature is 92.6mmHg. What is the concentration of CaCl_2 in mass percent?
January 20, 2010 by melissa

chemistry
80g of NaCl are dissolved in 400g H2O. if the vapor pressure of the water is 40 mmHg , what is the vapor pressure of NaCl above the solution?
February 12, 2013 by sheila

Science
The vapor pressure of water at 25 oC is 23.8 torr. Calculate the vapor pressure of a solution prepared by dissolving 35.0 g of urea [(NH2)2CO] in 75.0 g of water at 25 oC.
February 17, 2013 by Carlos

chemistry
The vapor pressure of pure water at 25 degrees Celsius is 23.77 mm Hg. What is the vapor pressure, in mm Hg, of water above a solution that is 1.5m glucose, C6H12O6?
December 11, 2011 by Anonymous

Chemistry
Explain the following observations using chem principles: When table salt and sugar are dissolved in water, it is observed that: 1. Both solutions have a higher boiling point than pure water. 2. the boiling point of .1 M NaCl solution is higher than that of .1 M C12H22O11 ...
January 17, 2008 by Anonymous

Chemistry
How would you prepare 500.0 of an aqueous solution of glycerol with a vapor pressure of 24.8mm Hg at 26 degree Celsius (vapor pressure of pure water=25.21mm Hg)? assume the density of the solution to be 1.00 g/mL.
September 10, 2012 by Kris

chem
reposted again a 275mL sample of vapor in equilibrium with 1-propylamine at 25C is removed and dissolved in 0.500L of H20. For 1-propalamine, Kb=3.72*10^-4 and the vapor pressure at 25C is 215 torr. (a)What should be the pH of the aqueous solution? (b) How many mg of NaOH ...
March 22, 2011 by kate-------------------------------------

chem
The total pressure in a flask containing air and ethanol at 257C is 878 mm Hg. The pressure of the air in the flask at 257C is 762 mm Hg. If the flask is immersed in a water bath at 400C, the total pressure is 980 mm Hg. The vapor pressure of ethanol at the new temperature is ...
January 31, 2008 by jin

Chem
The total pressure in a flask containing air and ethanol at 257C is 878 mm Hg. The pressure of the air in the flask at 257C is 762 mm Hg. If the flask is immersed in a water bath at 450C, the total pressure is 980 mm Hg. The vapor pressure of ethanol at the new temperature is ...
January 31, 2009 by Mary

chem
The total pressure in a flask containing air and ethanol at 257C is 878 mm Hg. The pressure of the air in the flask at 257C is 762 mm Hg. If the flask is immersed in a water bath at 300C, the total pressure is 980 mm Hg. The vapor pressure of ethanol at the new temperature is ...
April 26, 2009 by kristin

chemistry
given 2C6H6+15O2->12CO2+6H2O 1. Starting with a confined volume of 4.80L and O2 with a partial pressure of 223.1 torr at 25 degrees C. C6H6 is in excess. The reaction is allowed to proceed to completion. The container is returned to 25C. Both liquid water and benzene are ...
November 13, 2012 by stacy

chemistry
given 2C6H6+15O2->12CO2+6H2O 1. Starting with a confined volume of 4.80L and O2 with a partial pressure of 223.1 torr at 25 degrees C. C6H6 is in excess. The reaction is allowed to proceed to completion. The container is returned to 25C. Both liquid water and benzene are ...
November 13, 2012 by stacy

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