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Yes we will be given the molecular formula unless it’s a question that wants us to find it like in test 1. The reason the textbook doesn’t write it out is because you have access to the book and can look it up in the book( or that is what I am assuming).
Molecular formulas will generally be given on exams unless a question refers to a simpler compound such as HCl (hydrochloric acid). However, you should be familiar with common, simple molecular formulas.
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