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BITSAT 2015 Paper

Section: Chemistry

Question : 44 of 150

Marks: +1, -0

Which law of the thermodynamics helps in calculating the absolute entropies of various substances at different temperatures?

First law
Second law
Third law
Zeroth law

Validate

Solution:

The third law helps to calculate the absolute entropies of pure substances at different temperature. The entropy of the substance at different temperature. T may be calculated by the measurement of heat capacity change

S_T - S_0

= ΔS =

\int\limits_{0}^{T} \frac{C_p \cdot dt}{T}

Where

S_T

= Entropy at T K

S_0

= Entropy at 0K

C_P \cdot \log_e

= 2.30

C_P

log T

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