Molecular formula

[005095564]

What is the formula (molar mass of ACTUAL molecule / molar mass of emirical formula) used for? and how do you know when to use it?

[Pegah Nasseri 1K]

When you are asked to find the molecular formula using the empirical formula, you would divide the molar mass of the actual molecule by the molar mass of the empirical formula to find a number. You would use this number as a multiplier and would multiply the subscripts of the empirical formula by this number to find the molecular formula.

[Darren Nguyen 1F]

You use "(molar mass of ACTUAL molecule / molar mass of emirical formula)" any time the question asks for molecular formula. Whatever factor it turns out to be, you multiply each atom in the empirical formula with it. This will give you molecular formula.