Calculate the internal energy change when 2 moles of water at 0 degrees converts into ice at 0-degree centigrade?

Calculate the internal energy change when 2 moles of water at 0 degrees converts into ice at 0-degree centigrade? Correct Answer 12 KJ per mole

Energy change when 1 mol of water at 0-degree centigrade changes into ice at 0 degrees in centigrade is 6 kJ/mol, So the internal energy change when 2 moles of water at 0 degrees converts into ice at 0 degrees is 12 kJ/mole.
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