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Question: a band theory is used to explain the conductivity of...

Question details

a) Band theory is used to explain the conductivity of different solid crystals. Define the band width and calculate s band width assuming there is indefinite number of molecular orbitals in the s band.

b) Explain how metallic conductor, semiconductor and insulator are identified by band theory.

c) 1.0 mol CO2 behaving as a van der Waals gas, when it is confined under the following conditions: at 500 K in 150 cm3 .

For CO2 Van der Waals coefficients,

a: 3.610 L 2 atm mol-2 , b: 4.29x10-2 Lmol-1 . Gas constant R is 8.206 x 10-2 L atm K-1mol-1

i) Calculate the gas pressure (in atm),

ii) What is the molar volume of the gas (in L/mol),

iii) What is the pressure when it is ideal gas and use it to state dominating force in the above gas?

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