empirical formulas (speed)

[Sami Ryan 1G]

Is there a more efficient way to solve for the empirical formulas? I'm worried that if I get a question on the midterm, it'll take up lots of time, as there are so many steps and units to be careful of.

[Stephen_Kim_1D]

I think a fast and reliable way to solve for empirical formulas (for example if you're given percentages of each element in a compound) is to divide the percentages by their respective molar masses (giving you three quotients) and divide all of your quotients by the lowest-value quotient, and that'll give you the ratio of the elements in the compound. Sometimes you'll get decimal numbers like 1.33, in which case you multiply by 3 to get whole numbers.

[Madeline_Miller]

Hi! I agree with Stephen's response regarding the strategy you can use to speed up the process. But, at the same time, make sure you take the time you need to get it right! Just keep trying practice problems to get the hang of whatever method you'll use on the midterm, and you'll be great!