# Absolute Entropies of Solids, Liquids and Gases Can Be Determined by - Chemistry

Absolute entropies of solids, liquids and gases can be determined by

• Measuring heat capacity of substance at various temperatures
• Subtracting standard entropy of reactants from products
• Measuring vibrational motion of molecules
• Using formula ΔS° = ST° - SO°

#### Solution

Measuring heat capacity of substance at various temperatures.

The value of ST can be determined by measuring heat capacity of the solid at various temperatures and using the expression

DeltaS=S_T-S_0=S_T=int_0^T(Cp.dT)/T

Concept: Chemical Thermodynamics and Energetic - Work, Heat, Energy, Extensive and Intensive Properties
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