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how to work out empirical formula with percentages. So pause this video and see if you can come up with what is likely the empirical formula for our mystery molecule in here and as a little bit of a hint a periodic table of elements might be useful. As with most stoichiometry problems it is necessary to work in moles.
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This changes the percents to grams. 2 Convert the masses to moles. Heres how to find an empirical formula when given percent composition.
Determine which element has the smallest mole.
This changes the percents to grams. All right now lets work through this together and to help us make things a little bit more tangible Im just going to assume a mass for this. 3 Divide by the lowest seeking the smallest whole-number ratio. Convert the mass of each element to moles of each element using the atomic masses.
