4p+ 5o2 -> p4o10
if 0.489 mol of phosphorus burns what mass of oxygen is used? what mass of p4o10 is produced?

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.

we need the questions , i may then you.