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.

We'd generally need to see the "following" but I can tell you that empirical formulas are in simplest form and can't be reduced any further, so the molecular formulas would be the ones that could be divided by a whole number and remain whole numbers.