Here we're going to learn how to solve problems like these we're given the empirical formula and the molar mass of a compound and we have to figure out that compounds molecular formula we're asked to determine the molecular formula of a compound with the empirical formula CF 2 in a molar mass of 200 point 4 grams per mole let's begin by making a chart ok so here's a formula the empirical formula that we're starting with and I want to find its molar mass so to do that I'll look up carbon and fluorine on the periodic table I do 1 times the molar mass of carbon plus 2 times the molar mass of fluorine and I get 50 point zero one okay now CF 2 this here is an empirical formula which means that the number of atoms here the ratio of atoms here is a simplified or reduced as possible now there are a number of different molecular formulas that all have CF - is there empirical formula ok so for example C 2 F 4 is a molecular formula that has this as its empirical formula okay if we took both of these numbers and divided them by 2 we'd end up with CF 2 and going the other way we can kind of say that we got this formula by taking the empirical formula and multiplying it by 2 in other words this here this formula is kind of a multiple of the empirical formula we multiply it by 2 and we get this now it's the same for the molar mass okay we take the empirical formula multiplied by 2 and get this to find the molar mass of C 2 F 4 we can just take the molar mass of the empirical...

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