If the potential energy between two molecules is given by U = A r 6 + B r 12 , then at equilibrium, separation between molecules, and the potential energy are:

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Correct answer: C. 2 B A 1 / 6 , A 2 4 B

U = A r 6 + B r 12 f = - d U d r For equilibrium f = 0 so r = 2 B A 1 6 Then, U = A 2 4 B

If the potential energy between two molecules is given by U = A r 6 + B r 12 , then at equilibrium, separation between molecules, and the potential energy are:

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