Internal energy is

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(A) The exact value of internal energy is not known as it includes all types of energies of molecules constituting the given mass of matter,such as tr

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Partly potential and partly kinetic

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(A) The exact value of internal energy is not known as it includes all types of energies of molecules constituting the given mass of matter,such as translational,vibrational,and rotational energies. It also includes the kinetic and potential energy of the nuclei and electrons within the individual molecules and the manner in which the molecules are linked together. $E = E_{	ext{translational}} + E_{	ext{rotational}} + E_{	ext{vibrational}} + E_{	ext{electronic}} + E_{	ext{nuclear}}$ Thus,we can say that internal energy is partly potential and partly kinetic.

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