muhorosamuel40

What is the boiling point change for a soln containing 0.870 mol of naphthalene (a nonvolatile, nonionizing compound) in 250. g of liquid benzene? (Kb = 2.53°C/m for benzene)

#23

Biphenyl, C12H10, is a nonvolatile, nonionizing solute that issoluble in benzene, C6H6. At 25

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 15.4 g of biphenyl in 29.7 g of benzene?

A) The solubility of neon gas in water at 25°C is 1.05x10-3 M when the pressure of the Ne above the solution is 1.0 atm. the solubility of Ne (g) is?
B) the vapor pressure of pure ethanol at 60°C is 0.459 atm. Raoult's law predicts that a solution prepared by dissolving 10.0 mmol naphthalene in 90.0 mmol ethanol will have a vapor pressure of?

The vapor pressure of pure water at 20 degrees Celsius is 17.5torr. What is the vapor pressure at 20 degrees above a solutionthat has 85.5 g of sucrose (C12H22O11) and 75 g of urea [CO(NH2)2]dissolved per kg of water?

I need a detailed, step-by-step explanation. Thanks!!!

The vapor pressure of water at 20 degrees Celsius is 17.54mmHg.

a)The vapor pressure of an aqueous glucose(C₆H₁₂O₆) solution is found to be17.10mmHg. How much glucose (in grams) was added to 250mL of waterat 20 degrees Celsius to achieve this vapor pressure lowering? Thedensity of water is 1.00g/mL. Glucose is a nonvolatile solute.

b)Next we take 400mL of water (density is 1.00g/mL), and mix itwith 50mL of propanol (C₃H₈O, density is0.803g/mL). Calculate the mole fraction of propanol.

c)Propanol is a nonvolatile compound. The total vapor pressureof the water/propanol mixture in b) is 17.41mmHg at 20 degreesCelsius. Calculate the vapor pressure of propanol at 20 degreesCelsius.

Subject- civics

Identify and explain four of the six goals expressed in the American Constitution's Preamble for the American government system.

At 20 %u25E6C the vapor pressure of pure benzene is 75.0 Torr,while the vapor pressure or

pure toluene is 22.0 Torr. Benzene and Toluene, when mixed, formvery nearly ideal

solutions.

(a) What is the composition of the solution of these twosubstances that has a vapor

pressure of 50.0 Torr at this temperature?

(b) What is the composition of the vapor in equilibrium withthis solution?

PLEASE explain steps, having troble solving these two questions

1. a) What are the partial and total pressures of a solution obtained by mixing 35.8 g benzene, C6H6, and 56.7 g toluene, C7H8, at 25.0 degerees Celsius?

b) Determine the composition of the vapor above this benzene-toluene solution. At 25.0 degerees Celsius the vapor pressures of benzene and toluene are 95.1 mm Hg and 28.4 mm Hg respectively.

2. Claculate the mole fraction of benzene in a benzene-toluene solution that is in equilibrium at 25.0 degrees Celsius with a vapor phase that contains 62.0 mol % C6H6. At 25.0 degrees Celsius the vapor pressures of benzene and toluene are 95.1 mm Hg and 28.4 mm Hg respectively.

Part #1:

30.0 g of glucose (C6H12O6, molar mass = 180.16 g/mol) are dissolved in 100. grams of water (molar mass 18.02). What is the mole fraction of water in solution? Note: glucose is a non-volatile solute.

Part #2:

At 25.0 oC, pure water has a vapor pressure of 24.2 torr. What would the vapor pressure of the solution in part one be (in torr)?

Part #3:

A liquid is a mixture of benzene and toluene. The sample contains 0.225 moles of benzene and 0.775 moles of toluene. At a given temperature, pure benzene has a vapor pressure of 38.02 torr, while pure toluene has a vapor pressure of 8.73 torr. What is the total combined vapor pressure of the two liquids (in torr?)?

At 50 degree celsius, the vapor pressure of ethanol s 0.30atm , acetic acid is 0.08atm,water is 0.12atm, and acetone is 0.84atm

a)arrange these substance in order of increasing rates of evaporation

What do we think about the Mexican American War? Why did we go to war with Mexico? What does it mean that the U.S. General took the same route as Hernan Cortes 200 years earlier

Laboratory Automation II

1. Define a biological replicate and a technical replicate. Give an example of a hypothetical experiment and how you would sample these. what does each replicate type tell you?

Laboratory Automation II 

1. What does the term "sandboxing" mean with regards to implementing a LIMS? (note: this concept could be used when testing an implementing an automated assay side by side the non-automated version). How would we use a concordance study to validate this? 

When a process is being automated it has to be optimized and validated. what is a gradient and how is it related to experiment design - optimization - validation of an assay being automated?

Subject- civics

Which one of the goals listed in the Preamble do you think is the most important and why?  State the goal you've selected. Give examples to back up your opinion. In a couple of days then, come back to comment on a classmate's choice. State whether you agree or disagree with him or her. Explain why.

Writing Activity 11: In a one page essay, discuss what is the main responsibility of the executive branch, judicial branch, and legislative branch? Then explain how our government might be affected without the judicial branch if someone introduced a questionable "Bill" they wanted to become law. 

Subject-civics

I need to collect information and to write a full description for the following components related to “Gelatin” topic in skin tissue engineering/ wound healing :

Swelling and degradation properties

Porosity

Scaffold fabrication methods

Advantages and disadvantages

Conclusion

An aquarium 2 m long, 1 m wide, and 1 m deep is full of water. Find the work needed to pump half of the water out of the aquarium. (Use the fact that the density of water is 1000 kg/m³, and use 9.8 m/s² for g.)
W = J

I appreciate your perspective and the value you place on the time and energy expended in creating exceptional educational resources. While I believe that paid resources have their place in the education industry, I also firmly believe in making quality education and resources accessible to everyone, regardless of financial means. That's why I choose to offer my services for free to students who may not have the means to invest in paid courses or resources. In doing so, I hope to help level the playing field and ensure that every student has the opportunity to learn and grow, regardless of their financial circumstances. I believe that everyone deserves access to quality education and resources, and I'm proud to do my part in making that a reality.

What is humanities?

Why study humanities ?

How important is art in my chosen profession?

What kind of artist I am?

How is history divided in terms of art?

Who are the key person or artist in each era?

Define the covalent bond and types of bond?

 y=A x ln(x) + B x + F is the particular solution of the second-order linear DEQ: xy'' =5 where y'=4 at the point (2,9). Determine A,B,F. y=A x ln(x) + B x + F is also called an explicit solution. Determine the DEQ separable, exact, 1st-order linear, Bernouli? 

1249) The solution of some second order linear DEQ is exp(-4x)[9sin(1x)+ 1cos(1x)] which can also be expressed as A*exp(-D*x)*sin(F*x+G). Determine A,D,F, and G (degrees).

 y=A + Cexp(-0.5x^2) is the general solution of the DEQ: y' + xy = 44x. Determine A. Is the DEQ separable, exact, 1st-order linear, Bernouli? 

There are 5 anwers the A, the separable, the exact, 1st-order linear and the Bernouli.