If a compound has a molar mass of 180 g/mol and its empirical formula is ch2o, what is its molecular formula?
ch2o
c2h4o2
c6h12o6
c12h22o11

Explanation:

Molecular formulas is the actual number of atoms of each element in the compound while empirical formulas is the simplest or reduced ratio of the elements in the compound.

Thus,  

Molecular mass = n × Empirical mass

Where, n is any positive number from 1, 2, 3...

Given that the empirical formula is:-

Mass from the Empirical formula = 1×12 + 2×1 + 16= 30 g/mol

Given, Molar mass = 180 g/mol

So,  

Molecular mass = n × Empirical mass

180 = n × 30

⇒ n = 6

The molecular formula =

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