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Entropy

Absolute entr...

Question

Absolute entropies of solids, liquid and gases can be determined by:

A

Measuring heat capacity of substance at various temperatures

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B

Subtracting standard entropy of reactants from products

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C

Measuring vibrational motion of molecules

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D

Using formula

Δ S = S_{T} - S_{0}

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Solution

The correct option is D Measuring heat capacity of substance at various temperatures
The absolute entropy of any substance at any temperature $T$ is given by the formula:

$Δ S = S_{T} - S_{0} = \frac{n C_{p} d T}{T}$

Therefore, absolute entropy of solids, liquids and gases can be determined by measuring heat capacity.

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