An ice cube tray full ofice (235g) at 7.0'C is allowed to warm up to room temperature (22'C). How much energy must be absorbed by the contents of the tray in order for this to happen?

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante