# Calculate the pressure exerted by 0.4961 mol of N2 in a 10.290-L container at 25.0&deg;C. (See the table given below.)

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san jac
a sample of nitrogen gas contain 5.0mol in a volume of 3.5L calculate the new volume of the container if the pressure and temperature are kept constant but the number of moles of nitrogen is change to 2.5 mol

Chem (Help!)
I really need help answering these questions. A sample of CO2 gas with a mass of 0.30 g is placed in a 250 mL container at 400 K. What is the pressure in atmospheres exerted by this gas? Before you can put the numbers into an equation and solve for the volume, change the mass ...

chemistry
Hess¡¯ law says that when we add reactions together we can also add the enthalpies. Given the following set of reactions, use Hess¡¯ Law to calculate the enthalpy of the reaction given below. N2H4 + H2 ¡æ 2 NH3 ¥ÄH¡Æ = ? N2 + 3 H2 ¡æ 2 NH3 ¥ÄH¡Æ = -92.38 kJ/mol...

chemistry
Calculate the partial pressure of 24 g methane, 48 g of oxygen and 56 g of nitrogen contained in a 25L container. What is the total pressure.

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a cubical block of side 2cm is lying on a table. if the density of the material of the cube is 10000kg/m^3. find the pressure exerted by the block on the table. (g=10m/s^2).

chemistry
N2(g) + 3 F2(g) → 2 NF3(g) ΔH° = –264 kJ/mol ΔS° = –278 J/(mol∙K) a. calculate the maximum amount of non-PΔV work that can be accomplished through this reaction at a temperature of 500°C. b. Determine the temperature at which the equilibrium ...

chem12
for the equilibrium 2HI(g)--- H2(g) + I2 k eq = 8.0 2.0 mol of HI are placed in a 4.0 L container, and the system is allowed to reach equilibrium. Calculate the equilibrium concentration of all three gases. Inital 2HI 0.5mol/l H2 =0 I2=0 change 2HI= -2x H2=+x I2=+x equilibrium...

physics
sealed metal container can withstand a pressure difference of 0.630 . The container initially is filled with an ideal gas at 12 and 0.80 To what temperature can you cool the container before it collapses? (Ignore any changes in the container's volume due to thermal expansion

Chemistry
A piece of Na metal undergoes a complete reaction with H2O (l0 to produce sodium hydroxide and hydrogen. If 24.0 g of Na in a 3.50 L container is reacted with an excess amount of water at 25 degrees Celsius, calculate the total pressure (in atm) in the 3.50 L container when ...

chemistry
What mass (in grams) of CaCl2(s) must be dissolved in pure water at 10.0 deg Celsius to make a 26.4 mL solution and to increase the solution temperature to 16.4 deg Celsius? Assume that there is no heat loss from the solution and that the solution has the same physical ...

chemistry URGENT (1)
What mass (in grams) of CaCl2(s) must be dissolved in pure water at 10.0 deg Celsius to make a 26.4 mL solution and to increase the solution temperature to 16.4 deg Celsius? Assume that there is no heat loss from the solution and that the solution has the same physical ...

chemistry
A + B -> C + D (reversible reaction) a 2L container contains 1 mol of C, 1.6 mol of D, 0.8 mol of A snd 0.8 mol of B. Calculate the equillibrium composition of the reaction. Kc =0.065 I think C and D are forming A and B because there is higher concentration of C and D. So ...

chemistry
A + B -> C + D (reversible reaction) a 2L container contains 1 mol of C, 1.6 mol of D, 0.8 mol of A snd 0.8 mol of B. Calculate the equillibrium composition of the reaction. Kc =0.065 I think C and D are forming A and B because there is higher concentration of C and D. So ...

chemistry
help please, have no clue how to solve this. (a) you are given a mixture containing two compounds, A and B. both compounds have a solubility of 1g/100mL of solvent at 20 deg C and 16g/100mL of solvent at 100 deg C. The sample is composed of 3.5 g of A and 10 g of B. at 100 deg...

Chemistry
4.00 mol of solid A was placed in a sealed 1.00-L container and allowed to decompose into gaseous B and C. The concentration of B steadily increased until it reached 1.20 M, where it remained constant. A(s) <-------> B(g)+C(g) Then, the container volume was doubled and ...

fire engineering science 300
Calculate the volume of one mole of gas at STP(Standard Temperature & Pressure). Given: P=101 325 Pa n=1mol R=8,31 J K-1 mol-1 T=273K Given: P1=785mm Hg P2=760mm Hg T1=293 K T2=273 K V1=60cm3

AP Chemistry
Equal masses of Ne and Ar are placed in a rigid, sealed container. If the total pressure in the container is 1.2 atm, what is the partial pressure of Ar?

chem
A sample of carbon dioxide with a mass of 0.91 g was placed in a 335 mL container at 363 K. What is the pressure exerted by the gas? Answer in units of atm

chemistry
If a gaseous mixture is made of 2.41 g of He and 2.79 g of Ne in a evacuated 1.04-L container at 25 degrees Celcius, what will be the partial pressure of each gas and the total pressure in the container?

college chemistry
A closed container is filled with oxygen. The pressure in the container is 325 . What is the pressure in millimeters of mercury?

chemistry
If a gaseous mixture is made of 2.37 g of He and 2.73 g of Ne in an evacuated 1.19 L container at 25°C, what will be the partial pressure of each gas and the total pressure in the container?

Chem
Please tell me if these are right? A mixture of oxygen and helium is prepared for a scuba diver that will descend to 125 feet below the ocean surface. At that depth the diver breathes a gas mixture that has a total pressure of 8atm. If the particle pressure of the oxygen in ...

chemistry
calculate the pressure (in Pascals and bar) of 10^23 gas particles each with a mass of 10^-25 kg, in a 1 L container if the rms speed is 100m/s? What is the total kinetic energy of these particles? What is the temperature inside the container

Physics
the pressure at a point below a point below the surface of the sea is caused by both the height of the water above that and the air pressure on the surface of the sea. if the diver reaches a depth of 20m below the surface on the surface of the sea Calculate The total pressure ...

chemistry
the pressure in a 1.0 container is 988 ATM what is the pressure in a 2.56L container? ( use gas laws )

Chemistry
How much heat is given up when 20 g of steam at 100 deg C is condensed and cooled to 20 deg.C?

Chemistry
How mucyh heat is given up when 20 g of steam at 100 deg C is condensensed and cooled to 20 deg. C?

Chemistry
Calculate the heat (in kJ) required to change 40.0g of ice at -30.0 deg C to steam at 150.0 deg C?

Chemistry II
Dr.Bob222 please help given the following table of thermodynamic data substance delta HofF S PCl3 -288.07 kJ/mol 311.7 J/mol-k PCl3 -319.6 kJ/mol 217 J/mol- k determine the normal boiling point (C)of PCl3

geometry
Determine the measure of angle B of triangle ABC given the following information A= 42 deg c = 12 C = 96 deg

chemistry
A 79.9-L sample of a gaseous hydrocarbon, measured at 1.00 atm pressure and 25.0°C, is burned in excess oxygen, liberating 4.24 × 10^3 kJ of heat at constant pressure. What is the identity of the hydrocarbon? (R = 0.0821 L · atm/(K · mol)) Substance H°f (kJ/mol) CO2(g...

AP Chemistry
Hey guys! Stuck on another one: The reaction 2N2O(g) 2N2(g) + O2(g) has Kc = 3.5 × 10-18 at a particular temperature. If 0.20 mol of N2O is placed in a 1.00 liter container, what will be the N2 concentration when equilibrium is reached? 1. 4.4 × 10-9 mol/liter 4. 3.3 × 10-7...

Physics
1.9 mol of gas at a temperature of -180 C fills a 3.4 L container. What is the gas pressure? Never been good at physics or mol stuff, how do you set it up?

science; AP Chem
I don't know how to find the kpa for 35.78 m in this question. I know its a P1V1=P2V2 question, i just need the kpa for 35.78m pls! Question: Divers know that the pressure exerted by the water increases about 100 kPa with every 10.2 m of depth. This means that at 10.2 m below ...

Chemistry 105
A sample of nitrogen gas in a 1.86-L container exerts a pressure of 1.32 atm at 20 C. What is the pressure if the volume of the container is maintained constant and the temperature is raised to 354 C?

Chemistry
The pressure inside a hydrogen-filled container was 2.10 at 21 . What would the pressure be if the container was heated to 96?

chemistry
The pressure inside a hydrogen-filled container was 2.10 at 21 . What would the pressure be if the container was heated to 85?

chemistry
The pressure inside a hydrogen-filled container was 2.10 at 21 . What would the pressure be if the container was heated to 98 ?

chemistry
substance X has a molar mass of 107.6 g/mol. When 2.50 g of substance x burns in an iron calorimeter, the temp. of the calorimeter and the water (2.000 Kg) increases from 25.8 deg. C to 38.7 deg. C. What is the molar heat of combustion of substance X in KJ/Mole. Heat capacity ...

physics,plz.....give me answer as soon as possible
a pond of water filled with water apto 60m. 1)write formulato find the pressure of water exerted on the base of pond. 2)calculate the pressure exerted by the water on the base of pond?density of water is 1000kg/m3 3)half of the water was removed from the pond.what could be the...

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 ...

science
A piston pump containing 2 liters of nitrogen gas at 3000 psia (absolute) pressure empties its entire contents into a 10 liter pressure container. Before the transfer of gas the 10 liter container already contained nitrogen gas at 100 psia (absolute) pressure. Assuming ...

Chemistry
A piece of solid carbon dioxide, with a mass of 6.8 g, is placed in a 4.0 L otherwise empty container at 23°C. a) What is the pressure in the container after all the carbon dioxide vaporizes? b)If 6.8 g solid carbon dioxide were placed in the same container but it already ...

Chemistry
A piece of solid carbon dioxide, with a mass of 6.8 g, is placed in a 4.0 L otherwise empty container at 23°C. a) What is the pressure in the container after all the carbon dioxide vaporizes? b)If 6.8 g solid carbon dioxide were placed in the same container but it already ...

Chemistry
Calculate delta H for this reaction: N2 + 3H2 --> 2NH3 I am given the bond dissociation energy for N-N (163 kJ/mol), H-H (436 kJ/mol), and N-H (391 kJ/mol) I can't seem to find a similar problem anywhere, they are all given 2 or 3 similar equations.

Science
I need help understanding this. I keep re-reading and I'm still confused. Can you help me by re writing it in a way that I can understand? The pressure law states that for a constant volume of gas in a sealed container the temperature of the gas is directly proportional to its...

chemistry
thermochemistry chem conceptual. i just want to check my understanding of this Say you got this: 1)A + b=c A=4.0 grams and -91.8kj evolve How do you find change of H ? I guess you convert A to grams and then shove it under the evolved heat ? ie. change of H= -91.8kj/2 mol= 2)...

chemistry 106
calculate the pressure exerted by 1.00 moles of CO2 confined in a volume of 5.00 L at 450. K. Compare the pressure with that predicted by the ideal gas equation.

college chemistry
calculate the pressure exerted by 2.50 moles of CO2 confined in a volume of 5.00 L at 450K. Compare the pressure with that predicted by the ideal gas equation.

college chemistry
calculate the pressure exerted by 1.00 moles of CO2 confined in a volume of 5.00 L at 450. K. Compare the pressure with that predicted by the ideal gas equation.

Chemistry
Calculate the S(univ) for the following phase change at 25 deg celcius. The boiling point of heptane is 98.0 Celcius and has a Delta Hvap= +21.6kj/mol. C7H16(l)--> C7H16(g) Delta S= +79.0j/k I know that the equation is Delta Suniv= DSsys + DSsurr PLEASE SHOW ME HOW TO DO IT...

physics
a pond of water filled with water apto 60m. 1)write formulato find the pressure of water exerted on the base of pond. 2)calculate the pressure exerted by the water on the base of pond?density of water is 1000kg/m3 3)half of the water was removed from the pond.what could be the...

chemistry
472 mL of H2 gas was collected over water when 1.256 g of Zn reacted with excess HCl. The atmospheric pressure during the experiment was 754 mm Hg and the temperature was 26 degrees C. A. Write the balanced chemical equation (I have this) Zn + HCl ---> ZnCl2 + H2 B. What is...

Chemistry
Lithium metal is a highly reactive metal that oxidizes instantly in water or air. Given the data below, calculate the energy required to heat 10.0 g of Li from 150.0 °C to 200.0 °C. Molar heat capacity (solid) = 3.58 J/°C • mol Molar heat capacity (liquid) = 4.379 J/°C...

Lab Questions
1. Use the Van der Waals equation to calculate the pressure exerted by 1.00 mol of Cl2; in 22.41 L at 0.0 degrees C. The constants for Cl are a = 6.49 L2 atm/mol2 and b = 0.0526 L/mol. 2. How much potassium chlorate is needed to produce 20.0 mL of oxygen at 670 mm Hg and 20 ...

Science
What pressure is exerted by 0.010 mol of methane gas if it is volume is 0.26 L at 373°K?

chem 12
for the equilibrium 2HI(g)--- H2(g) + I2 k eq = 8.0 2.0 mol of HI are placed in a 4.0 L container, and the system is allowed to reach equilibrium. Calculate the equilibrium concentration of all three gases. Inital 2HI 0.5mol/l H2 =0 I2=0 change 2HI= -2x H2=+x I2=+x equilibrium...

maths
a roofer charges \$25 per hour for himself and \$15 per hour for his assistant. On a recent job the assistant worked 2 hours less than the roofer and the tot charge for labour was \$290. Let r be the number of hours that the roofer worked. Which of the following equation can be ...

chemistry calculations
At 25 deg C, Kc is 5.84x10-3 for the dissociation of dinitrogen tetraoxide to nitrogen dioxide. N2O4(g) ==== 2NO2(g) a) Calculate the equilibrium concentration of both gases when 4.00 grams of N2O4 is placed at 2.00-liter flask at 25 deg C. b) What will be the new equilibrium ...

chem
For the reaction: N2+3H2 <-----> 2NH3 1.000 mol N2 and 1.000 mol H2 are placed in a 1.000 L container and allowed to establish equilibrium. When equilibrium is established the [N2] =0.921M. Calculate the equilibrium concentrations of hydrogen and ammonia. Calculate K.

chem
At what temperature will a 1.0 g sample of neon gas exert a pressure of 500 torr in a 5.0 L container ? or At what temperature will a 0.0470 mol of a gas fill a balloon to 1.20 L under 0.988 atm pressure ?

Chemistry
F2 (g) <--> 2 F (g) A 1.00 mol sample of F2 is placed in a 100. L container at 1000K. What is the pressure of the F2 before any decomposes?

Chemistry
F2 (g) <--> 2 F (g) A 1.00 mol sample of F2 is placed in a 100. L container at 1000K. What is the pressure of the F2 before any decomposes?

Chemistry
F2 (g) <--> 2 F (g) A 1.00 mol sample of F2 is placed in a 100. L container at 1000K. What is the pressure of the F2 before any decomposes?

Chem Lab Questions
1. Use the Van der Waals equation to calculate the pressure exerted by 1.00 mol of Cl2; in 22.41 L at 0.0 degrees C. The constants for Cl are a = 6.49 L2 atm/mol2 and b = 0.0526 L/mol. 2. How much potassium chlorate is needed to produce 20.0 mL of oxygen at 670 mm Hg and 20 ...

chemistry
N2(g) + 3 F2(g) → 2 NF3(g) ΔH° = –264 kJ/mol ΔS° = –278 J/(mol∙K) a. Using the information provided above (only), calculate the maximum amount of non-PΔV work that can be accomplished through this reaction at a temperature of 500°C. b. ...

Chemistry
Calculate the vapor pressure of a solution of 0.48 mol of cholesterol in 6.0 mol of toluene at 32°C. Pure toluene has a vapor pressure of 41 torr at 32°C. (Assume ideal behavior.)

science help
The two tables below give the relative-risk of developing a stroke, in relation to blood pressure and body mass index. The data are based on a population of men from the USA. The values in the first table are given in comparison with the total population. The values in the ...

chemistry
The gaseous product of a reaction is collected in a 30.0 L container at 37 degrees C. The pressure in the container is 2.5 atm and the gas has a mass of 85.0 grams. What is the molar mass of this gas? I know the correct answer is 28.8 g/mol but I need to know how to get the ...

Chemistry
Calculate how many milliliters of carbon dioxide would be produced theoretically from 2.0g of sucrose at 25 deg Cel and 1 atm pressure.

chemistry
A gaseous mixture in a 25.00 L container is made of 16.0 g N2 and 14.0 g Ar and has a total pressure of 1.00 atm. 1.Calculate the partial pressure of the N2 in the mixture. the ans is 0.620 atm 2.Calculate the temperature of the gas mixture. can someone explain to me how to do...

chemistry
Calculate ∆T for the reaction. Assume the initial temperature of both reactants is 25.0◦C. Calculate the volume of the reaction mixture. Calculate the mass of the reaction mixture. Assume the density of the mixture is 1.03 g mL^(-1). Calculate the heat transferred ...

chemistry
For the reaction shown below complete the following calculations. H2(g) + C2H4(g) --> C2H6(g) (a) Estimate the enthalpy of reaction using the bond energy values in Table 9.4. (b) Calculate the enthalpy of reaction, using standard enthalpies of formation. (ΔH°f for H2...

Chemistry
A chemist is preparing to carry out a reaction at high pressure that requires 36.0 mol of hydrogen gas. The chemist pumps the hydrogen into a 15.5L rigid steel container at 25 degrees Celcius. To what pressure (in atmospheres) must the hydrogen be compressed? What would be the...

Chemistry
1.278 mL of water at 10°C was placed in a 3.0 L container that was sealed and evacuated. Then, 3440 J of heat was added to the water. Determine the pressure inside the container after heating. (Assume all of the heat goes into the water.) d (H2O(s)) 1.00 g/cm3 Csp(H2O(s)) 2....

Chemistry
4.00 mol of solid A was placed in a sealed 1.00-L container and allowed to decompose into gaseous B and C. The concentration of B steadily increased until it reached 1.20 M, where it remained constant. A(s) <-------> B(g)+C(g) Then, the container volume was doubled and ...

An industrial chemist puts 1.00 mol each of H2(g) and CO2(g) in a 1.00-L container at 800oC. When equilibrium is established, 0.49 mol of CO(g) is in the container. Find Kc at 800 C for the following reaction: H2(g) + CO2(g) ⇌ H2O(g) + CO(g).

physics
A container has a large cylindrical lower part with a long thin cylindrical neck. The lower part of the container holds 12.5 m^3 of water and the surface area of the bottom of the container is 5.00 m^(2 ). The height of the lower part of the container is 2.50m and the neck ...

College Chemistry
The radius of Xe is 1.3*10^-8 cm. A 100-mL flask is filled with Xe at a pressure of 1.4 atm and the temperature is 290 K. Calculate the fraction of the volume that is occupied by Xe atoms.

Physical science
9 mol HI(g)is sealed with H2(g)in an empty 2 dm container when equilibriup is reached by the reaction..H2(g)+I2(g)=2HI(g) at 130 C it found that there are 5 mol HI(g)in the equilibrium mixture.calculate the equilibriup constant

Chemsitry II
The partial pressure of CH4(g) is 0.185 atm and that of O2(g) is 0.300 atm in a mixture of the two gases. a) What is the mole fraction of each gas in the mixture? b) If the mixture occupies a volume of 11.5 L at 65 degress C, calculate the total number of moles of gas in the ...

maths (trigonometry)
calculate the following: 1)sin 50 degree-sin 70 degree+sin 10deg. 2)cos square 48 deg.- sin square 12 deg. 3)tan 20 deg.+tan 40 deg.+root 3 tan 20 tan 40 Plz. Solve these

chemistry
A piece of solid carbon dioxide, with a mass of 7.4 g, is placed in a 4.0-L otherwise empty container at 27°C. (a) What is the pressure in the container after all the carbon dioxide vaporizes? 1.0atm (b) If 7.4 g solid carbon dioxide were placed in the same container but it ...

physics
A lost shipping container is found resting on the ocean floor and completely submerged. The container is 5.7 m long, 2.7 m wide, and 2.3 m high. Salvage experts attach a spherical balloon to the top of the container and inflate it with air pumped down from the surface. When ...

Physics
A lost shipping container is found resting on the ocean floor and completely submerged. The container is 6.0 m long, 2.2 m wide, and 2.3 m high. Salvage experts attach a spherical balloon to the top of the container and inflate it with air pumped down from the surface. When ...

Chemistry
The standard entropy change for 1.00 moles of Ar as it evaporates at -185.7 °C (∆H°-185.7 = 1558 cal mol-1) is? 1. 17.8 J mol-1K-1 2. 87.5 J mol-1K-1 3. 15.0 J mol-1K-1 4. 46.0 J mol-1K-1 5. 74.5 J mol-1K-1 6. none of the previous answers I thought I would use deltaG=...

Science
A table, with four legs, weighs 5 N. The area of contact of one of its leg with the ground is 2.5 x 10-3 m². A man, with a mass of 9 kg, sits on the centre of the tabletop. What is the total pressure exerted on the ground by the table with the man on it?

Chemistry
A sample of zinc metal reacts completly with an excess of hydrochloric acid: Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g) The hydrogen gas produced is collected over water at 25.0 °C. The volume of the gas is 78.0 L & the pressure is 0.980 atm. Calculate the amount of zinc metal...

Chemistry
The following reaction is first order, C2H6==> 2CH3. If the rate constant is equal to 5.5 x 10-4 s^-1 at 1000 K, how long will it take for 0.35 mol of C2H6 in a 1.00 L container to decrease to 0.20 mol in the same container? Thank you very much

science
a hemisphere container is made with the following dimensions. the external diameter of the container is 12 cm. the internal diameter of the container is 6 cm. it is filled with water to the brim. what is the density of the empty container if the total mass of the container ...

physics
a hemisphere container is made with the following dimensions. the external diameter of the container is 12 cm. the internal diameter of the container is 6 cm. it is filled with water to the brim. what is the density of the empty container if the total mass of the container ...

Chemistry
The following table contains data for the equilibrium reaction CH3COOH(g)+ C2H5OH(g)↔ CH3COOC2H5(g)+ H2O(g) T = 100oC. Each row in the table represents a different experiment (diffferent intial concentrations). Initial concentration Equilibrium concentration...

physics
The pressure at the bottom of a cylindrical container with a cross-sectional area of 46.5 cm2 and holding a fluid of density 480 kg/m3 is 115 kPa. (a) Determine the depth of the fluid. (b) Determine the pressure at the bottom of the container if an additional 3.00 10-3 m3 of ...

chemistry
a sample containing 1.50 mol neon gas has a volume of 8.00L.what is the new volume of the gas in liters when the following changes occur in the quantity of the gas at constant pressure and temperature? a.a leak allows on-half of the neon atoms to escape. b. a sample of 25.0g ...

Chemistry
My question is what is the molar mass of 1.00 mol of Li? Can you explain in detail and I have another question: What is the molar mass od 1.00 mol of Ag but if you help me with the first question, then can you just tell me to the other by myself so I can see if I did it right ...

chemistry
A 9.96 mol sample of methane gas is maintained in a 0.836 L container at 296 K. What is the pressure in atm calculated using the van der Waals' equation for CH4 gas under these conditions? For CH4, a = 2.25 L2atm/mol2 and b = 4.28E-2 L/mol.

Chemistry
For the reaction below at a certain temperature, it is found that the equilibrium concentrations in a 5.00 L rigid container are [H2] = 0.0500 M, [F2] = 0.0100 M, and [HF] = 0.400 M. If 0.340 mol of F2 is added to this equilibrium mixture, calculate the concentrations of all ...

chemistry
For the reaction below at a certain temperature, it is found that the equilibrium concentrations in a 4.87-L rigid container are [H2] = 0.0496 M [F2] = 0.0116 M [HF] = 0.429 M. H2(g) + F2(g) <==> 2 HF(g) If 0.185 mol of F2 is added to this equilibrium mixture, calculate ...

Attn: DrBob222
A .326L container holds 0.146g of Ne and an unknown amount of Ar at 30C and the total pressure is 627 mmHg. Calculate the moles of Ar present? (I have calculated temp 308K, pressure is 0.825 atm and moles of Ne are .007) Chem - DrBob222, Wednesday, March 3, 2010 at 3:25pm T is...

chemistry
At a given temperature, you have a mixture of benzene (vapor pressure of pure benzene = 745 torr) and toluene (vapor pressure of pure toluene = 290 torr). The mole fraction of benzene in the vapor above the solution is 0.590. Assuming ideal behavior, calculate the mole ...

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