Question

Which liquid, methanol or ethanol has the largest vapor pressure value at room temperature?

Answer 1

Methanol has the larger vapor pressure at room temperature because it has a lower molecular weight when compared with ethanol, which implies it has weaker intermolecular forces.

Answer 2

Methanol

Step-by-step explanation:

From the options given in the question ,

Methanol has the highest vapor pressure at room temperature ,

As methanol ( CH₄O ) has lower molecular mass as compare to ethanol ( C₂H₆O ) ,

The molecules with higher molecular mass , have stronger interaction , i.e. , London - dispersion forces .

Therefore , due to stronger interaction between the atoms , it becomes difficult to vaporize the liquid and to generate the vapors of the respective liquid , and , therefore , lesser vapor pressure .