Aluminum forms a layer of aluminum oxide when exposed to air which protects the bulk metal from further corrosion. 4Al( s) + 3O 2( g) → 2Al 2O 3( s) Using the thermodynamic data provided below, calculate ΔS° for this reaction.

the answer is either b or c

14 days is the half-life of phosphorus-32

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.