The sugar fructose has an empirical formula of ch2o . the mass spectrum shows a molecular ion peak at a mass of 179.9. what is the molecular formula of fructose?

- Molecular formula of the sugar is .

Solution:- An empirical formula of the sugar is and it's molecular ion peak is 179.9. It means the molecular mass of the sugar is 179.9 gram per mol.

Empirical formula mass of the sugar = 12 + 2(1) + 16 = 30

Number of empirical formula units =   = 6

From above calculations it is clear that six empirical formula units makes the molecular formula of the sugar.

So, the molecular formula of the sugar is .