Evaporation and Intermolecular Forces Data Table At (t1-t2) Substance 24.3 25. 1

Question

Evaporation and Intermolecular Forces Data Table At (t1-t2) Substance 24.3 25. 12.2 1-propanol 1-butanol 21.2 Post-Lab Graphing Exercises 1. Based on the At values you obtained from ethanol and 1-propan use Excel to create a graph of molar mass (x) versus (y). Be sure to include a descriptive title and labeled axes. Fit a line to the two data points and show the equation of that line on your graph. 2. You will use this line to extrapolate the At values the remaining four compounds of (alcohols and We call these predicted values. this, plug the molar mass of a given compound into the equation of the line and calculate y. 3. Insert your At values into the table on the next page. Copy the actual At values into the table as well. Explain why the predicted and actual values are either close or very different from each other, in terms of intermolecular forces. 4. Use Excel to plot a second graph of At values ofthe four alcohols versus their respective molar masses. Plot molar mass on the horizontal (x) axis and At on the vertical (y) axis. Make sure your graph has a descriptive title and that your axes are labeled with units. Comment on dependence between molar mass and the At values. the 5.

Explanation / Answer

The relationship between molar masses and dt is an inverse relationship

1. butanone and 1-butanol have different dt values as butanol can form strong hydrogen bonds among itself to have a low dt value which is absent in case of butanone.

2. Methanol has strong intermolecular hydrogen bonds.

Butanol has weakest intermolecular forces

butanol has lowest dt and methanol has the highest dt value due to intermolecular forces

butanol < ethanol < methanol

3. among ketone

strongest intermolecualr forces for butanone

wekest intermolecular forces for acetone

Acetone does not have sufficient induced polar and hydrophobic interaction as seen in case of butanone.

4. The fast moving air, removes heat from the body and makes the temperature go down and swimmer feels chilled.

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