Question

The absolute value of which of the following quantity of a substance cannot be determined?

• A. Entropy
• B. Enthalpy
• C. Volume
• D. Heat capacity

Answer 1

The correct option is C Volume

Absolute value of Enthalpy of a substance cannot be determined. Enthalpy of a system can be given as H = E + PV, where E is the internal energy of the system. And we know that value of internal energy of a system cannot be determined absolutely therefore, it is impossible to obtain an absolute value of enthalpy of the system.

Hence, the correct answer is option B.