Final answer:
The condensed formula for ethane is CH3CH3, indicating two carbon atoms each bonded to three hydrogens. The condensed formula for heptane is CH3(CH2)5CH3, showing a chain of seven carbon atoms with the first and last carbon atoms bonded to three hydrogens and the five middle carbons each bonded to two hydrogens.
Step-by-step explanation:
To draw the condensed formula for the alkanes ethane and heptane, we can use the guidelines for organic molecules. The condensed formula lists the formula of each carbon atom in the backbone of the molecule.
Ethane (C2H6)
The condensed structural formula for ethane is CH3CH3, indicating that each carbon is bonded to three hydrogens and the two carbons are bonded to each other.
Heptane (C7H16)
The condensed structural formula for heptane is CH3(CH2)5CH3. This suggests that the heptane molecule is made up of seven carbon atoms in a chain, with the first and last carbon atoms bonded to three hydrogen atoms and the other five carbon atoms (represented by (CH2)5) each bonded to two hydrogen atoms.