(14.1.50) 0.03 mol of helium are enclosed in a cylinder with a piston which maintains a constant pressure in the helium. Initial
ly the helium is immersed in thermal bath with at 250K. Suddenly, the helium is removed from this thermal bath and plunged into a thermal bath at temperature 350K. Determine (a) the increase in the entropy of the helium. (Hint the entropy change for the helium is the same as if it had been taken through this temperature change by a reversible process.) (b) the increase in entropy of the universe. (Answer: 0.032 J/K)
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Explanation:
In a hexagonal-close-pack (HCP) unit cell, the ratio of lattice points to octahedral holes to tetrahedral holes = 1 : 1 : 2
let the :
Number of lattice point = 1x.
Number of octahedral points = 1x
Number of tetrahedral points = 2x
If anions occupy the HCP lattice points and cations occupy half of the tetrahedral holes.
Number of anions occupying the HCP lattice points, A= 1x
Number of cations occupying the tetrahedral points, B =
The formula of the compound will be =
If anions occupy the HCP lattice points and cations occupy all of the tetrahedral holes.
Number of anions occupying the HCP lattice points, A= 1x
Number of cations occupying the tetrahedral points, B = 2x
The formula of the compound will be =