Chemistry Homework
Empirical Formula
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Name:
DO NOT ROUND NUMBERS TIL END
1a) How is an empirical formula different than a molecular formula?
b) List the 4 steps to find the empirical formula:
1:
2:
3:
4:
2) Determine the empirical formula of Boric acid (BxHyOz) which has the mass composition:
17.5% B
77.7% O
4.9% H
3) Determine the empirical formula of Glycerol (CxHyOz) containing the mass composition:
39.1% C
8.7% H
52.2% O
4) Acetic acid is the main component of vinegar and has the mass percentages 40% C, 6.7% H, and
53.3% O. What is the empirical formula of acetic acid (CxHyOz)?
Chemistry Homework
Empirical Formula
Show All Work
Name:
DO NOT ROUND NUMBERS TIL END
5) An organic molecule (CxHySz) is composed of 38.66% C, 9.73% H, and 51.61% S by mass. What is
the molecular formula if the molar mass is 185 g/mol?
6) Allicin is an organic compound responsible for the notable garlic smell. What is the molecular
formula (CaHbScOd) if the percent mass composition is 44.4% C, 6.21% H, 39.5% S, 9.86% O and the
molar mass is about 162 g/mol?
7) An organic molecule (CxHyNz) is composed of 27.27% C, 9.09% H and 63.64% N by mass. What is
the molecular formula if the molar mass is 132 g/mol?