Which of the following statements correctly describes a relationship between empirical formula and molecular formula?
a) The empirical formula molar mass is greater than the molecular formula for all compounds.
b) The empirical formula and the molecular formula are the same for all compounds.
c) The empirical formula molar mass is less than or equal to the actual molar mass for all compounds.
d) The molecular formula is twice the empirical formula molar mass for all compounds.