Lab 10

Prompt: In your post, include an image of your pre-lab table. Include an image of your data table. Answer questions number 2-4 from your lab manual in your post.

Pre-Lab Table

Data Table

#2: Different intermolecular forces and different molar masses contributed to the varying differences in temperature. All of the substances had at least one hydrogen bond, but they each had different molar masses. If a substance has a high molar mass it is harder to for it to evaporate. Water and Glycerin were slightly different in that they respectively had two and three hydrogen bonding sites which made it even more difficult to bond.


#3: Methanol has a molar mass of 32.042 and Ethanol has a molar mass of 46.069. Methanol's change in temperature was 17.9 degrees while Ethanol's was 12 degrees. Ethanol has a lower change due to Ethanol having a higher molar mass. A higher IMF requires more energy so it would take longer to evaporate, limiting the amount the temperature would have dropped.

#4: OH- bonds create hydrogen bonds, which are the stronger than Dipoles and LDF's. They increase the IMF of the compound, which means it would take longer for the substance to evaporate.