How many moles of Carbon are in CH3,CH2,CH3?

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.

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter