## Chemistry: An Atoms-Focused Approach

(a) In CH$_4$, we can count 4 atoms of hydrogen. (b) In C$_3$H$_8$, we can count 8 atoms of hydrogen. (c) In C$_6$H$_6$, we can count 6 atoms of hydrogen. (d) In C$_6$H$_{12}$O$_6$, we can count 12 atoms of hydrogen.