Molecular Physics | Thermodynamics Answers

The mean speed of oxygen molecule is 450 m/s. If the radius of an oxygen molecule is 1.8 x 10^-10m, calculate mean time between two successie collisions and mean free path. Take n = 3 x 10^25 m

Why it is possible to loosen caps on screw top bottles by dipping it on hot water???

How many grams of ice must we add in 500g of water which has temperature 30 °C so when the ice melts completely, the final temperature of water would be 5 °C?

Steam is passed through a copper vessel of 1000 g of specific heat 0.4 J/g-*C. 16.1 g of steam had condensed to at 10*C.Find the Specific latent heat of vapourization of steam

7. If an ice cube melts at 0oC but water also freezes at 0oC, what is the difference between melting and freezing in terms of (a) the energy involved in the phase changes and (b) particles of the substances during the phase changes?

10. If measurements of a gas are 75L and 300 kilopascals and then the gas is measured a second time and found to be 50L, describe what had to happen to the pressure (if temperature remained constant). Include which law supports this observation.





11. Which statement matches the scientists to their research on atomic theory?
a. Dalton used gold foil; Bohr made the planetary model of atoms
b. Thomson used gold foil; Dalton believed atoms had no internal structure
c. Rutherford used gold foil; Thomson discovered electrons
d. Rutherford discovered electrons; Thomson made the planetary model of atoms

What is a Gibbs paradox? How did it arise?

Calculate the coefficient of viscosity of hydrogen at STP. Take
r = 8.90×10−2 kg m−3, l = 2×10−7m and =1.38×10−23 JK−1.

a) State the principle of equipartition of energy. Write a relation between number of
degrees of freedom, number of particles constituting the system and the total number
of constraints. Calculate the degrees of freedom for (i) single atom, (ii) diatomic
molecule.

A reversible process can only be idealised and cannot be achieved in practice.
Justify.

Write an expression for the partition function for an ideal gas made up of N
indistinguishable particles. Using this expression, obtain Sackur-Tetrode equation.