Answer :
Final answer:
The change in internal energy when 1.726 kg of water boils at 101 kPa and turns into steam is positive, as energy is absorbed during the phase change.
Explanation:
The question asks to determine the change in internal energy when 1.726 kg of water boils at 101 kPa, and each kg of boiling water is replaced by 1700 L of steam. When water boils and changes phase from liquid to gas (steam), it absorbs energy in the form of heat. This energy is known as the latent heat of vaporization. The change in internal energy during the phase change will be positive because energy is absorbed by the water to overcome intermolecular forces during the transition to the gaseous state. The amount of heat absorbed would be equal to the mass of the water multiplied by the specific latent heat of vaporization for water at the given pressure (which is nearly the same as at standard atmospheric pressure).
