The empirical formula and molecular mass of a compound are CH2O and 180 g, respectively. The molecular formula of the compound is:
1. C9H18O9
2. CH2O
3. C6H12O6
4. C2H4O2

Hint: n=Molecular massEmpirical formula mass
Empirical formula mass=CH2O
Formula mass is 
=12+2×1+16=30
Molecular mass=180
n=Molecular massEmpirical formula mass
=18030=6
Molecular formula=n×empirical formula
=6×CH2O
=C6H12O6