Answer:
1) H = 14; C =6.
2) H = 14; C =6.
3) H = 14; C =6.
4) H = 14; C =6.
5) H = 14; C =6.
Molecular formula of this molecules is C₆H₁₄. Those molecules are alkanes with same molecular formula and different structural formula.
General formula for alkanes is CₓH₂ₓ₊₂.
Hexane is alkane (acyclic saturated hydrocarbon, carbon-carbon bonds are single) of six carbon atoms.