Department of Chemistry
and Physics
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Department of Chemistry and Physics |
| Worksheets |
Empirical Formula
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1. Determine the empirical formula from the molecular formula:
| a) C6H6 | h) C2H2 |
| b) C2H6 | i) Na2SO4 |
| c) C3H8 | j) C6H5N |
| d) Fe3(CO)9 | k) P4O10 |
| e) C2H4O2 | l) Re2Cl6 |
| f) N2H4 | m) Se3O9 |
| g) CaBr2 | n) LiCl |
2. Determine the empirical formula from the percent composition for each of the following:
a) 92.24 % C; 7.76 % H
b) 36.48 % Na; 25.44 % S; 38.08 % O
c) 49.99 % C; 5.61 % H; 44.40 % O
d) A compound analyzes as 79.08 % C; 5.54 % H and 15.38 % N. What is the molecular formula if the molar mass is 273.36 g/ mol?
e) 38.76 % Ca; 19.97 % P; 41.27 % O