Answer
a. Capsaicin has 25 hydrogen atoms present around its carbon atoms.
b. Fexofenadine has 35 hydrogen atoms present around its carbon atoms.
Work Step by Step
A carbon atom can form four covalent bonds since it has four valence electrons. Each carbon must then have four bonds (e.g. 4 single bonds, 2 double bonds, 1 single bond and 1 triple bond) to have a neutral charge. Thus, a hydrogen atom must be added to every carbon atom to achieve a total of four bonds.