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

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.  

must be a molecular formula as empirical formula will be

must be a empirical formula.

must be a molecular formula as the empirical formula will be

can be a molecular formula or a empirical formula.

can be a molecular formula or a empirical formula.

A molecular formula is a formula that accounts for all the atoms of elements present in the compound. There is only one molecular formula among the options which is C4H8O4.

An empirical formula gives the ratio of atoms of each element present in a compound while the molecular formula shows the actual number of atoms of each element in a compound.

We can get back the empirical formula from the molecular formula by getting the ratio of atoms of elements in the formula.

Clearly, if we look at the formula C4H8O4, we can see that the atoms occur in a ratio 1:2:1. This means that its empirical formula must be CH4O.

The formula, C4H8O4 is the only formula among the options for which this sort of operation is possible therefore, it is the only molecular formula among the options.

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indium, and thallium have three electrons i think

i have no clue hope you find the answer