Statement-I : Absolute values of internal energy of substances can not be determined.
Statement-II

Question

Statement-I : Absolute values of internal energy of substances can not be determined.
 Statement-II : It is impossible to determine exact values of constituent energies of the substances.\

Professor PC Thomas Classes · Answer

(a) : Internal energy is given by :
$
E=E_{	ext {translational }}+E_{	ext {rotational }}+E_{	ext {vibrational }}+E_{	ext {bonding }}+E_{	ext {electronic }}
$
Accurate measurement of some forms of energy which contribute to the absolute value of internal energy for a given substance in a given state is impossible. So difference of the initial state and final state is calculated and is denoted by $\Delta E=E_f-E_i$.