DATA AND Atmospheric pressure Vapor Pressure Liquids. Substance Temperature Temp

Question

DATA AND Atmospheric pressure Vapor Pressure Liquids. Substance Temperature Temperature K 300 K. Air pressure no correction corrected Vapor EXTENSION The Clausius-Clapeyron equation describes the relationship between vapor pressure and RT B where In P is the natural logarithm of the pressure, s the heat of vaporization, Tis absolute temperature, and B is a vapor reamanged in slope- positive constant. If this equation is intercept form mx b): In P the slope, should be equal to-AHvap/R. If a plot of ln P vs. 1IT made, the heat of Pro: is m from the slope of the curve. Plot the graph using Logger vaporization can be determined 1. Go to Page 2 of the experiment file by clicking on the Next Page button, 2. In the table, enter the four vapor pressure-temperature data pairs. To do this: in a. Click on the first cell in the (K) data column in the table.Type value and temperature value (K) for the first data pair, and press the ENTER key. in its b. The cursor will now be in the Vapor Pressure (kPa data column -type press ENTER. three data pairs values. points. c. Continue in this manner to enter the last automatically rescale the data d. If necessary, click on the Autoscale button,IA to 10-5 Chemistry with Computers

Explanation / Answer

Graph

To plot the graph, the values of measured pressure are missing. After obtaining these values, convert them to vapour pressure by using:

vapour pressure= Air pressure- measured pressure

NB: Air pressure is the corrected pressure obtained by the calculations mentioned in the point 2 of the image.

Question 5:

After plotting the above graph, you might see a linear increase in the vapour pressure with increase in temperature (though it might not be perfectly linear owing to experimental errors). The reason for this linear curve is that with increase in the temperature, more molecules have enough kinetic energy to overcome the intermolecular forces of attraction of the liquid methanol.

Question 6:

Both molecules, ethanol and methanol, have -OH functionality which increases their hydrogen-bonding capacities. However, methanol (32 amu) has lower molecular weight than ethanol (46 amu) and thus has weaker dispersion force. Hence, methanol has higher vapour pressure and it evaporates more quickly compared to ethanol.

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