Question

In each pair of compounds, pick the one with the higher vapor pressure at a given temperature. Explain your reasoning.

Answer 1

Answer:

The answer is:

$PART \ A: CH_4\\\\PART \ B: CH_30H\\\\PART \ C: H_2CO$

Explanation:

Parts A:

The vapor pressure is higher in $CH_4$ because it is non-polar, while $CH_3Cl$ is polar. $CH_4$ has a lower molar weight as well.

Part B:

Although hydrogen bonding is found in both commodities, the vapor pressure is higher because of the smaller molar mass of $CH_30H$.

Part C:

$H_2CO$ does not show hydrogen due to the increased vapor pressure

$CH_3OH$ bonding.