What is the equation used to calculate the energy required for a change of state?

The equation is energy for a change of state = mass x specific latent heat.

Evidence lens: Use the data, graph feature, practical observation, or particle behaviour that proves the answer. This question asks: What is the equation used to calculate the energy required for a change of state. The correct response is The equation is energy for a change of state = mass x specific latent heat., 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 recall and apply the equation energy for a change of state = mass x specific latent heat. 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 381 is distinct because it uses this exact question context and the evidence lens rather than a generic particle-model sentence.