A material has a specific latent heat of fusion of 80,000 J/kg. If 0.25 kg of this material is frozen, what is the energy released (Changes of state and specific latent heat)

The correct answer is 20,000 J.

Definition lens: Give the precise definition, then add a context sentence that shows how it is used. This question asks: A material has a specific latent heat of fusion of 80,000 J/kg. If 0.25 kg of this material is frozen, what is the energy released (Changes of state and specific latent heat). The correct response is 20,000 J, because density links mass and volume, so the answer must preserve which quantity is being calculated. In Changes of state and specific latent heat, the marking point should connect directly to calculate mass when energy transferred and specific latent heat are known. 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 402 is distinct because it uses this exact question context and the definition lens rather than a generic particle-model sentence.