What's the limitation to do enthalpy of combustion of alcohols?

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.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a

the answer is c. nacl