Final answer:
The correct molecular formula for caffeine is C8H10N4O2.
Step-by-step explanation:
The correct molecular formula for caffeine is C8H10N4O2. This is option a) in the given choices. In order to determine the correct molecular formula, we need to consider the empirical formula and the molar mass of caffeine.
The empirical formula of caffeine is the simplest ratio of the atoms present in the compound, which is C4H5N2O. The molar mass of caffeine is 194.19 g/mol. By comparing the molar mass of the empirical formula to the molar mass of caffeine and considering the subscripts present in the empirical formula, we can determine that the molecular formula of caffeine is C8H10N4O2.