logo

Ask Questions, Get Answers

X
 

According to third law of thermodynamics, the entropy at 0 K is zero for

(a) elements in their stable form
(b) perfectly crystalline solids
(c) substances at 1 atm and $25^\circ C$
(d) $N_2O$

2 Answers

Answer: perfectly crystalline solids
For perfectly crystalline solids at 0 K, all molecular motion ceases and particles are closely packed. Thus, randomness and hence entropy is minimum.
answered Feb 24, 2014 by mosymeow_1
 
Solution :
The entropy of a perfect crystal is zero when the temperature of the crystal is equal to absolute zero (0 K).
At zero kelvin the system must be in a state with the minimum possible energy, thus this statement of the third law holds true if the perfect crystal has only one minimum energy state
answered Jan 23 by meena.p
 

Related questions

...
close