Third Law of Thermodynamics

Define absolute entropy?

The $\mathrm{\Delta S}$ for the reaction $2{\mathrm{H}}_2\left(\mathrm{g}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\to 2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$ at $300 \mathrm{K}$ when ${\mathrm{S}}_{{\mathrm{H}}_2}°\left(\mathrm{g}\right)=126.6,{ \mathrm{S}}_{{\mathrm{O}}_2}°\left(\mathrm{g}\right)=201.20$

${\mathrm{S}}_{{\mathrm{H}}_2\mathrm{O}}°\left(\mathrm{I}\right)=68.0{\mathrm{JK}}^{-1}{ \mathrm{mol}}^{-1}$ respectively is

The standard entropies of ${\mathrm{N}}_2\left(\mathrm{g}\right),{\mathrm{H}}_2\left(\mathrm{g}\right)$ and ${\mathrm{NH}}_3\left(\mathrm{g}\right)$ are $191.5,130.5,192.6{\mathrm{JK}}^{-1}{ \mathrm{mol}}^{-1}$. The value of $\mathrm{\Delta S}°$ of formation of ammonia is

What is residual entropy of the substance?

Calculate the entropy change for the following reaction at $298 \mathrm{K}$ and $1 \mathrm{atm}$ pressure.

$2\mathrm{CO}\left(\mathrm{g}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\stackrel{ }{\to }2{\mathrm{CO}}_2\left(\mathrm{g}\right)$, the absolute entropy values (${\mathrm{S}}^{\circ }$) for ${\mathrm{CO}}_2\left(\mathrm{g}\right)=213.6 \mathrm{J} \mathrm{K} {\mathrm{mol}}^{-1}, \mathrm{CO}\left(\mathrm{g}\right)=197.6 \mathrm{J} \mathrm{K} {\mathrm{mol}}^{-1}$ and ${\mathrm{O}}_2\left(\mathrm{g}\right)=205.0 \mathrm{J} \mathrm{K} {\mathrm{mol}}^{-1}$.

Write the statement of third law of thermodynamics.

Third law of thermodynamics helps in the calculation of the absolute entropy of a substance at any temperature ‘$\mathrm{T}$’.

The third law of thermodynamics states that, the entropy of a perfect crystal at a temperature of zero degree Celsius is equal to zero.

At what temperature is the entropy of a perfectly crystalline substance taken as zero?

State the third law of thermodynamics.

Why is it impossible for any substance to have an absolute entropy zero at temperature greater than $0 \mathrm{K}$?

State third law of thermodynamics. What is its usefulness?

Which of the following allotropes of sulphur has maximum $\mathrm{S}$ at $0° \mathrm{K}$?

Cotyledons are also called-

Among the following, the reaction that is accompanied by a decrease in the entropy is

The true statement amongst the following is

Identify the correct statement regarding entropy.

Entropy is a measure of disorder. For perfect crystalline substances at $0\mathrm{K}$, entropy becomes:

For a perfectly crystalline solid C_p,m = aT³ , where 'a' is constant. If C_p,m is $\text{0.42 }\frac{\text{J}}{\text{K mol}}$ at 10 K, molar entropy at 20 K is :