A 1.5 kg sample of liquid water at 100 °C is cooled to 0 °C. If the specific latent heat of fusion of water is 3.34 × 10⁵ J kg⁻¹, how much energy is released during the freezing process (Changes of state and specific latent heat)

The correct answer is 5.01 × 10⁶ J.

Definition lens: Give the precise definition, then add a context sentence that shows how it is used. This question asks: A 1.5 kg sample of liquid water at 100 °C is cooled to 0 °C. If the specific latent heat of fusion of water is 3.34 × 10⁵ J kg⁻¹, how much energy is released during the freezing process (Changes of state and specific latent heat). The correct response is 5.01 × 10⁶ J, because changes of state are explained by particle energy and arrangement. In Changes of state and specific latent heat, the marking point should connect directly to explain that energy transferred during a change of state changes particle potential energy rather than average kinetic energy. If the question includes values, the working must keep the appropriate unit and operation; if it is an explanation, it must name the relevant particle behaviour or energy change. This item belongs to Internal energy and energy transfers, so avoid answers that switch to a different quantity, confuse heat with temperature, or describe gas pressure without collisions when collisions are the reason. Checkpoint 426 is distinct because it uses this exact question context and the definition lens rather than a generic particle-model sentence.