Question

Some of the formulas below could be either molecular or empirical formulas; however, some could only be molecular formulas. Which of the following formulas must be molecular formulas? Select all that apply.
H2O2

CH

C4H8O4

C4H5N2O

NO2

Answer 1

H2O2 and C4H8O4 must be molecular formulas.

Answer 2

Answer: $H_2O_2$

$C_4H_8O_4$

Explanation:

Molecular formula is the chemical formula which depicts the actual number of atoms of each element present in the compound.  

Empirical formula is the simplest chemical formula which depicts the whole number of atoms of each element present in the compound.  

$H_2O_2$ must be a molecular formula as empirical formula will be $OH$

$CH$ must be a empirical formula.

$C_4H_8O_4$ must be a molecular formula as the empirical formula will be $CH_2O$

$C_4H_5N_2O$ can be a molecular formula or a empirical formula.

$NO_2$ can be a molecular formula or a empirical formula.