Acompound contains 14.5 g of magnesium and 3.5 g of oxygen. what is the mass percent of oxygen in the compound?

im not completely sure if this is correct, but this is what I did. and how I got my answer.

(3.5 g) / (14.5 + 3.5) g = 0.19 = 19% O by mass

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.