A certain substance has a heat of vaporization of 36.21 kJ/mol. At what Kelvin temperature will the vapor pressure be 3.00 times higher than it was at 351 K?

if you mean hydrogen and oxygen then water is the product

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.