Which of the following molecular formulas are also empirical formulas? * 1. ribose (C₅H₁₀O₅)
2. ehtyl butyrate (C₆H₁₂O₂)
3. chlorophyll (C₅₅H₇₂MgN₄O₅)
4. DEET (C₁₂H₁₇ON)Which of the following molecular formulas are also empirical formulas?

tracks, burrows, eggshells, nests, tooth marks, or gastroliths

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.