Physical Chemistry Answers

6. Suppose that you are travelling in the Space Shuttle Endeavor on a journey to Mars. The atmosphere (of the vehicle) consists of 20% oxygen and 80% helium by volume. It was noticed before take off from the Kennedy Space Center that there is a small leakage which if unchecked, would lead to a continual loss of gas at a rate of 0.05 atm/day through effusion. If the temperature in the space shuttle is maintained at 22oC and the volume of the vehicle is 15,000 liters. Calculate the amounts of helium and oxygen in grams that must be stored on a 5-day journey to allow for the leakage.

A second-order reaction of a form: 2 A → B reaches a conversion equal to X₁ = 0.99 in τ₁ = 7,91 h, at a temperature T₁ = 298 K. Calculate the temperature T₂ required to reach a conversion of X₂ = 0.995 in τ₂ = 1 h, with twice the initial concentration of reactant A. The activation energy of the reaction is E_A = 99600 kJ/mol. Universal gas constant: R = 8,314 J/(mol*K).

Assuming ideal solution behavior, what is the boiling point of a 033m solution of a nonvolatile solute in benzene?

what is the osmosis epheromen, Explain the importance of osmosis 

Drive an expression for band structure of an open circuit PN junction. Consider the PN junction at 300K with doping concentration N d =2*10^ 15 cm^ -3 and N a =1.5*10^ 18 cm^ -3 in the P and N side of junction respectively. Determine the contact potential across the junction. Assume that intrinsic concentration of germanium is n i =2.5*10^ 13 cm^ -3 at 300K.

Assume that gallium arsenide has dopant concentration of N d =1*10^ 13 cm^ -3 and Na 2.5*10^ 13 cm^ -3 at T = 300K (n = 1.8 X 10¹6 cm3, electron's mobility = 8500 and hole's mobility = 400). Find the following

a) Is this material being p-type or n-type?

b) What is the hole's concentration?

c) What is the electrons concentration?

d) Find the conductivity due to majority carriers.

e) Find the conductivity due to minority carriers.

At 273 K measurements on argon gave B = -21.7 cm3 mol-1 and C = 1200 cm6 mol-2, where B and C are the second and third virial coefficients in the expansion of Z in powers of 1/Vm. Assuming that the perfect gas law holds sufficiently well for the estimation of the second and third terms of the expansion, calculate the compression factor of argon at 100 atm and 273 K. From your result, estimate the molar volume of argon under these conditions

Describe the physical significance of the centrifugal term in the radial part of Schrodinger's equation of H atom

How many moles of Argon are there n 20.0 L at 25 C and 96.8 KPa

Using axis sketch a graph to show the successive ionization energies of flourine