1. Two of the liquids, n-pentane and 1-butanol, have nearly the same molecular w
ID: 1083184 • Letter: 1
Question
1. Two of the liquids, n-pentane and 1-butanol, have nearly the same molecular weights, but significantly different changes in temperature during evaporation. Explain the difference in At values of these substances. 2. Which of the alcohols studied has the strongest intermolecular forces of attraction? The weakest intermolecular forces? Explain using the results of this experiment and structural formulas of the alcohols. Which of the alkanes studied has the stronger intermolecular forces of attraction? The weaker intermolecular forces? Explain using the results of this experiment. 3. Complete the sentence by inserting words such as higher/lower, weaker/stronger (use bold font for the words inserted): Higher T values mean 4. volatility of the organic compounds, intermolecular forces of attraction between the molecules and values of enthalpy of vaporization. Compounds with AT generally smell Using Excel plot a graph of AT values of the four alcohols versus their respective molecular weights. Title the graph and use an appropriate scale that is, fill the entire page with your graph. Be sure to label your axes correctly 5. Rank 1-chlorobutane, isobutane, n-butane, butyric acid in order of increasing their volatility. Explain your reasoning. Search the internet for the structural formulas if necessary. 6.Explanation / Answer
1. Even though n-pentane and 1-butanol have molecular weights of 72 and 74, respectively, 1-butanol has a much smaller due to the presence of hydrogen bonding between its molecules. This results in a stronger attraction, and a slower rate of evaporation.
2. The 1-butanol has the strongest attractions between its molecules. Methanol has the weakest attractions. The 1-butanol has the largest molecules and resulting strongest dispersion forces. This gives it the lowest evaporation rate and the smallest t.
3. The n-hexane has the stronger attractions between its molecules. The n-pentane has the weaker attractions. The n-hexane has the larger molecules and the resulting stronger dispersion forces. This gives it a lower evaporation rate and the smallest t.
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