Rank the compounds
CH3OH CH3CH2OH CH3CH2CH2OH
in terms of increasing evaporation rate.
1.
CH3CH2CH2OH < CH3OH < CH3CH2OH
2.
CH3OH < CH3CH2CH2OH < CH3CH2OH
3.
CH3OH < CH3CH2OH < CH3CH2CH2OH
4.
CH3CH2OH < CH3CH2CH2OH < CH3OH
5.
CH3CH2CH2OH < CH3CH2OH < CH3OH
CH3CH2CH2OH < CH3CH2OH < CH3OH
The correct answer is:
3. CH3OH < CH3CH2OH < CH3CH2CH2OH
To determine the evaporation rate of compounds, you need to consider several factors such as molecular weight, intermolecular forces, and boiling point.
Let's break down the compounds and analyze their factors in order to determine their evaporation rates:
1. CH3OH (methanol) - It has the lowest molecular weight among the three compounds, which means it has weaker intermolecular forces. The boiling point of CH3OH is 64.7°C.
2. CH3CH2OH (ethanol) - It has a slightly higher molecular weight than methanol, indicating slightly stronger intermolecular forces. The boiling point of CH3CH2OH is 78.4°C.
3. CH3CH2CH2OH (1-propanol) - It has the highest molecular weight among the three compounds, leading to stronger intermolecular forces. The boiling point of CH3CH2CH2OH is 97.2°C.
Based on these factors, the compounds can be ranked in terms of increasing evaporation rate as follows:
3. CH3OH < CH3CH2OH < CH3CH2CH2OH
Therefore, the correct answer is option 3.