Question

Which compound has the highest molar mass

Answer 1

first you must know the structure.
polyethlyene is the repeated C2H4 (ethene)
ethane is C2H6 = 30
octane is C8H18 = 114
octanal is C8H16O = 128
octanal has the highest.
molar mass refer to periodic table. where C=12 H=1 O=16

Answer 2

Answer: Option (a) is the correct answer.

Step-by-step 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
`C_(2)H_(6)` and its molar mass is
`[(12 * 2) + (1 * 6)]g/mol` = 30 g/mol

An octane molecule is
`C_(8)H_(18)` and its molar mass is
`[(12 * 8) + (1 * 18)]g/mol` = 114 g/mol

An octanal molecule is
`C_(8)H_(16)O` and its molar mass is
`[(12 * 8) + (1 * 16) + 16]g/mol` = 128 g/mol

Thus, we can conclude that polyethylene, a polymer of ethane has the highest molar mass.