If 20 mL of methanol (d = 0.792g/ml) are dissolved in 80 mL of ethanol (d = 0.789 g/ml), what is the percent by mass of methanol in this solution?

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explanation:

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.

the answer to your question is c