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Assertion : Absolute values of internal energy of substances can not be determined.
Reason : It is impossible to determine exact values of constituent energies of the substances.
Options:
Reason : It is impossible to determine exact values of constituent energies of the substances.
Solution:
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The correct answer is:
If both the assertion and reason are true and reason is a correct explanation of the assertion.
Internal energy is given by :
$E=E_{\text {translational }}+E_{\text {rotaional }}+E_{\text {vibrational }}+E_{\text {bonding }}+E_{\text {electronic }}$
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
$$
\Delta E=E_f-E_i
$$
$E=E_{\text {translational }}+E_{\text {rotaional }}+E_{\text {vibrational }}+E_{\text {bonding }}+E_{\text {electronic }}$
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
$$
\Delta E=E_f-E_i
$$
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