Name_______________________
Empirical Formula
Notes
When discovering ________________, scientists don’t know what the _____________ of a compound is until they get
the _____________ of ___________ of each element. From there, they can determine its _______________________.
Empirical formulas: a ratio (determined by __________________ and ______________) to get the _____________
whole number ratio to make a ____________________.
What if a substance contains 36.84% nitrogen and 63.16% oxygen, what is the empirical formula?
Assuming that you had 100 grams of this substance, then it would be 36.84 grams of nitrogen and 63.16 grams of
oxygen?
First: ___________________________________________________________________________________________
Nitrogen- grams to moles
Oxygen- grams to moles
We just figured out the ratio (moles) within the given amounts. But now we need to get the ratio between each
element
Second: ___________________________________________________________________________________________
What if a substance contains 35.98% aluminum and 64.02% sulfur, what is the empirical formula?
What if a substance contains 81.82% carbon and 18.18% hydrogen, what is the empirical formula?
Empirical Formula w.s #1
A compound contained 92.25% carbon and 7.75% hydrogen. What is the empirical formula of the compound?
Vanadium oxide is used as an industrial catalyst. The percent composition of this oxide is 56.0% vanadium and 44.0%
oxygen. Determine the empirical formula for vanadium oxide.
While trace impurities of iron and chromium in natural corundum form the gemstones ruby and sapphire, they are
basically a binary compound of aluminum and oxygen, with 52.9% Al. Find the empirical formula and give the chemical
name for corundum
Analysis of a compound containing chlorine and lead reveals that the compound is 59.37% lead. What is the empirical
formula and name of the compound?