Question

periodic table
which of the molecules has the highest boiling point? enter the number of the liquid into the text entry box. do not enter the molecular formula.
liquid 1: ch₄
liquid 2: ch₃ch₃
liquid 3: ch₃ch₂ch₃
liquid 4: ch₃ch₂ch₂ch₃

Explanation:

Step1: Analyze intermolecular forces

All these are non - polar hydrocarbons, and the main intermolecular force is London dispersion force. The strength of London dispersion force increases with the increase of molar mass and number of electrons.

Step2: Compare molar masses

The molar mass of $CH_4$ (Liquid 1) is approximately 16 g/mol, $CH_3CH_3$ (Liquid 2) is approximately 30 g/mol, $CH_3CH_2CH_3$ (Liquid 3) is approximately 44 g/mol, and $CH_3CH_2CH_2CH_3$ (Liquid 4) is approximately 58 g/mol.

Step3: Determine highest boiling point

Since Liquid 4 has the highest molar mass among them, it has the strongest London dispersion force and thus the highest boiling point.

Answer:

4