Take a 100 g sample which will give you
93.7 g C
6.3% H.
Convert each to mols.
93.7/12 = ?
6.4./1 = ?
Now find the ratio of the two and that gives the empirical formula. There isn't enough information to find the molecular formula.
Naphthalene, commonly known as moth balls, is composed of 93.7% carbon and 6.3% hydrogen.
determine the empirical for naphthalene.
molecular formula for Naphthalene. Determine the number of empirical formulas you would need to make a full naphthalene molecule.
3 answers
1. 93.7g C x mole/12.00g C =7.8
6.3g H x mole/1.01g H =6.23
2. divide the smallest number. (6.23)
H 6.23/6.23 =1
C 7.8/ 6.2= 1.25
3. Multiply by 4.
H 1x4 = 4
C 1.25x4 = 5
4. Empirical formula is C5H4
6.3g H x mole/1.01g H =6.23
2. divide the smallest number. (6.23)
H 6.23/6.23 =1
C 7.8/ 6.2= 1.25
3. Multiply by 4.
H 1x4 = 4
C 1.25x4 = 5
4. Empirical formula is C5H4
Why multiply by 4???