Which information must be known about a compound to find the molecular formula from the empirical formula?

Which answer lists the fundamental forces in order from strongest to weakest

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same

Ok, so i have 2 questions. try to answer them both: (the topic is fire) 1) how can you represent the chemical reaction of fire? 2) what kind of bond is formed in this chemical reaction