Which substances have the same empirical formula?
Sample Formula
1 CH3OH
2 CH2O
3 C6H12O6
4 C2H4O2
5 C7H5O2
6 C8H8
a. Samples 1 and 3
b. Samples 1, 2, and 4
c. Sample 1 and 4
d. Samples 2, 3, and 4