The vapor pressure of ethanol is 50.00 kPa at 338.8C but it fell to 49.62 kPa when 8.69g of an involatile organic compound was dissolved in 250g of ethanol DeltaHfusion (ethanol) =4.90kJ/mol
(1)Calculate the molar mass of the compound
(2) The freezing point of pure ethanol is 114C. What is the freezing point of this solution?
The vapor pressure of ethanol is 50.00 kPa at 338.8C but it fell to 49.62 kPa...
3. When 7.45 grams on a nonvolatile organic compound was dissolved in 250 grams of 2- propanol, the vapor pressure was measured to be 48.58 kPa. If the vapor pressure of pure 2- propanol is 50.00 kPa at 333.75 K, what is the molar mass of the nonvolatile organic compound?
The common laboratory solvent ethanol is often used to purify substances dissolved in it. The vapor pressure of ethanol, CH2CH,OH, is 54.68 mm Hg at 25 °C In a laboratory experiment, students synthesized a new compound and found that when 35.52 grams of the compound were dissolved in 246.7 grams of ethanol, the vapor pressure of the solution was 53.38 mm Hg. The compound was also found to be nonvolatile and a non-electrolyte. What is the molecular weight of this...
An aqueous CaCl2 solution has a vapor pressure of 80.2 mmHg at 50 ∘C. The vapor pressure of pure water at this temperature is 92.6 mmHg. What is the concentration of CaCl2 in mass percent? A hypothetical solution forms between a solid and a liquid. The values of the thermodynamic quantities involved in the process are shown in the following table. Action Enthalpy separation of solute 11.5 kJ/mol separation of solvent 21.8 kJ/mol formation of solute-solvent interactions -86.7 kJ/mol solute...
7. The vapor pressure of water at 25.0°C is 23.8 torr. Determine the mass of glucose (molar mass = 180 g/mol) needed to add to 500.0 g of water to change the vapor pressure to 23.3 torr. (20 points) Thyroxine, an important hormone that controls the rate of metabolism in the body, can be isolated from the thyroid gland. If 0.455 g of thyroxine is dissolved in 10.0 g of benzene, the freezing point of the solution is found to...
A cyclohexane (c-hex) solution is prepared by fully dissolving 9.11g of a newly synthesized organic compound in 100.g cyclohexane. The freezing point of the solution is depressed by -5.80 oC from the normal freezing point of 6.55 oC for pure cyclohexane ( Kf,c-hex= 20.0 oC kg/mol , MWc-hex = 84.0 g/mol). (a) What is the molecular weight (molar mass) of the organic compound? (b) What is the vapor pressure of the cyclohexane for this solution at 298K?
5. Ethanol and methanol are form an ideal solution at 20 °C. Vapor pressure of pure ethanol and pure methanol at 20 °C is 44.5 and 88.7 mmHg, respectively. If 100 g of ethanol and 100 g of methanol are mixed into a solution, calculate: (a) the mol fractions of ethanol and methanol in the solution, (b) the partial pressures of ethanol and methanol and total pressure of the solution, and (c) the mol fraction of methanol in a vapor...
A) The vapor pressure of an aqueous solution of potassium bromide at 31 °C is 0.04173 atm. The vapor pressure of pure water at the same temperature is 0.04434 atm. Estimate the freezing point of the solution. For water, Kfp = 1.86 °C/m. Answer:_____ °C B) Complete combustion of 3.769 g of a compound of carbon, hydrogen, and oxygen yielded 8.120 g CO2 and 3.325 g H2O. When 13.90 g of the compound was dissolved in 253 g of water,...
show working please
(2) The vapor pressure of pure ethanol at 20°C is 44.6 mmHg, What is the vapor pressure in the mmHg of a solution with 16.0 g of glucose (C6H1206) dissolved in 80.0 g of ethanol (CH3OH) at 20°C.
3. The vapor pressure of liquid ethanol at 126°C is 505 kPa and its second virial coefficient at this temperature is - 523 cm /mol. Here, use the virial equation of state with an expansion in 1/V (as in problem #1). a. Calculate the fugacity of ethanol vapor at saturation at 126°C assuming ethanol is an ideal gas. b. Calculate the fugacity of ethanol vapor at saturation at 126°C assuming ethanol is described by the virial equation of state truncated...
At 25C, the vapor pressure of pure benzene is 0.1252 atm. When
6.50 g of a sold sample of naphthalene,C10H8(128.17 g/mol), is
dissolved in 76.0 g of pure benzene, C6H6, calculate the vapor
pressure of benzene above the solution
oy looL 2. Raoult's Law. At 25 °C, the vapor pressure of pure benzene is 0.1252 atm. When 6.50 g of a solid sample of naphthalene, C10Hg (128.17 g/mol), is dissolved in 76.0 g of pure benzene, C6H6 (78.0 g/mol), calculate...