A compound has an empirical formula of C2H6. What additional piece of evidence is needed to determine the molecular formula?

a. percent composition of carbon

b. mass of the sample

c. relative numbers of atoms of each element

d. molar mass of the compound

I think the correct answer from the choices listed above is option A. The additional piece of information needed to determine the molecular formula would be percent composition of carbon. A molecular formula is a formula that gives the number of atoms of each of the elements present in one molecule of a specific compound.

It is d). Molar mass of the compound.

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