Answer: Option (a) is the correct answer.
Explanation:
Molar mass of a substance means the sum of atomic masses of all the atoms present in a substance.
A polyethylene molecule is made up of "n" number of repeated units ethylene. Hence, it will have highest molar mass because there are more number of atoms present in a polyethylene molecule.
Whereas an ethane molecule is [tex]C_{2}H_{6}[/tex] and its molar mass is [tex][(12 \times 2) + (1 \times 6)]g/mol[/tex] = 30 g/mol
An octane molecule is [tex]C_{8}H_{18}[/tex] and its molar mass is [tex][(12 \times 8) + (1 \times 18)]g/mol[/tex] = 114 g/mol
An octanal molecule is [tex]C_{8}H_{16}O[/tex] and its molar mass is [tex][(12 \times 8) + (1 \times 16) + 16]g/mol[/tex] = 128 g/mol
Thus, we can conclude that polyethylene, a polymer of ethane has the highest molar mass.
