Question

At absolute zero, the entropy of a pure crystal is zero. This statement is :

• A. first law of thermodynamics
• B. second law of thermodynamics
• C. third law of thermodynamics
• D. zeroth law of thermodynamics.

Answer 1

Answer: (C)

third law of thermodynamics

The third law of thermodynamics states that, "The entropy of a perfectly crystalline substance at zero K or absolute zero is taken to be zero".

$\Delta S={\int }_0^T{C}_{p}d㏑T=2.303{\int }_0^T{C}_{p}d㏒T$

where, $C_p$ = heat capacities and T = temperature between 0 K and T K.