A laboratory analysis of vanillin, the flavoring agent in vanilla, determined the mass percent composition: c, 63. 15%; h, 5. 30%; o, 31. 55%. Determine the empirical formula of vanillin.

It depends on the subject for me. some exams are easier than others so i usually go through it and answer questions i know based on my general knowledge, then double check after. going through the lesson can a lot  because the exams can be  very lesson-specific, but sometimes they are ridiculously long so a lot of people don't take the time. i did find that, when i went through the lessons, i was making 100's on my exams vs strictly using + the internet and  i make 90's. 

Answera major is needed to earn a bachelors;

Answer60 minutes;

4based on his attributes it can be concluded that through history could have "compelled" him to act in this way.