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Physical Chemistry
how many grams of isopropyl alcohol should be added to 1L of water to give a solution that will not freeze above -16 degrees Celsius?
Physical Chemistry
at 25 degrees Celsius, the vapor pressure of the pure water is 23.76 mmHg and that of an aqueous sucrose is 23.328 mmHg. calculate the molality of the solution.
Physical Chemistry
0.144 g of an aluminium compound X react with an excess of water to produce a gas. This gas burns completely in O2 to form H2O and 72cm3 of CO2 only. Volume of CO2 was measured at room temperature and pressure. Deduce the formula of X
Physical Chemistry
The Clausius-Clapyeron equation ln(p2/p1) = -ΔHvap/R (1/t2 - 1/t1) is derived assuming that ΔHvap is independent of temperature.
Find ΔHvap as a function of temperature for ethanol at constant external pressure.
Find ΔHvap as a function of temperature for ethanol at constant external pressure.
Physical Chemistry
Two chemists discovered a goldmine. They took a sample and discovered that besides gold, the sample contained four other impurities listed below. How can these scientists seperate their gold from the sample?
Au - nonmagnetic, H20-insoluble, melting point (500 Celsius)
Silica - solid. highly impure, nonmagnetic, melting point (900 celsius)
MgCl2 - H20-soluble, crystal, nonmagnetic
Fe - highly magnetic, H20-insoluble
FeSO4 - solid, nonmagnetic, highly electrostatic
Au - nonmagnetic, H20-insoluble, melting point (500 Celsius)
Silica - solid. highly impure, nonmagnetic, melting point (900 celsius)
MgCl2 - H20-soluble, crystal, nonmagnetic
Fe - highly magnetic, H20-insoluble
FeSO4 - solid, nonmagnetic, highly electrostatic
Physical Chemistry
A solution contains a solute with molar mass 94.5 g/mol. The solution is
1.77 m and also 1.70 M. Calculate the density of the solution.
1.77 m and also 1.70 M. Calculate the density of the solution.
Physical Chemistry
What is the boiling point of a solution made by adding magnesium chloride, MgCl2, into water? The mole fraction of magnesium chloride in the solution formed is 0.04946. Use the formula of the salt to obtain i.
[Kb = 0.512˚C/m and Tb˚ = 100˚C]
[Kb = 0.512˚C/m and Tb˚ = 100˚C]
Physical Chemistry
When 79.3 g of a particular compound is dissolved in 0.878 kg of water at 1atm pressure, the solution freezes at -1.34˚C. If the compound does not undergo ionization in solution and is nonvolatile, determine the molecular mass of the compound and freezing point depression.
[Kf = 1.858˚C/m and Tf˚ = 0˚C]
[Kf = 1.858˚C/m and Tf˚ = 0˚C]
Physical Chemistry
you have the following linear, conjugated molecule: C8H10
a). write an expression for the length (L) (8 Pi e-)
B). Assume average C-C, C=C bond length is (a). Determine the probability of finding a spin-up Pi e- in the highest energy level (HOMO) between C1 and C2.
C). Light with wave length Lambda is incident on this organic polymer, and ionized electrons of mass (Me-) are detected. The ionization potential of the molecule is Phi. write an expression for the de Brogile wavelength, (lambda e-) of the ejected electron.
a). write an expression for the length (L) (8 Pi e-)
B). Assume average C-C, C=C bond length is (a). Determine the probability of finding a spin-up Pi e- in the highest energy level (HOMO) between C1 and C2.
C). Light with wave length Lambda is incident on this organic polymer, and ionized electrons of mass (Me-) are detected. The ionization potential of the molecule is Phi. write an expression for the de Brogile wavelength, (lambda e-) of the ejected electron.
Physical Chemistry
A small still is separating propane and butane at 135 C and initially contains 10 kg moles of a mixture whose composition is x=.30(x mole fraction butane)additional mixture(xf=.30)is fed at the rate of 5kg mol/hr.if the total volume of the liquid in the still is constant and the concentration of the vapor from the still xd is related to xs as follows: xd=xs/(1+xs).how long will it take for the value of xs to change from.30 to.40? what is the steady state value of xs in the still(i.e.,when xs becomes constant?)
