Question

DATA Temperature (°C) Temperature (K) /T (K) Vapor Pressure (mm Hg) In (Vapor Pressure) 299.0K 302.2 K 30% 30q.2K 0.003344 D.003210 o -1 -l -I 149.U |い·3· 1912 0T.2 1. Plot In(Vapor Pressure) vs. 1/T using a spreadsheet program like Excel. Include the correlation coefficient and the lincar regression equation for the best-fit straight line through the points.dsa Attach the graph to this report. I Iniar regresstoneqvation035 Calculate the heat of vaporization for ethanol based on the slope obtained from the linear regression equation. Show the calculation in the space below. 2. 3. Given that the value for the heat of vaporization for ethanol is 38.6 kJ/mole, calculate the percent error in your measured value. Show the calculation in the space below.

Answer 1

Solution:- (2) The plot of lnP vs 1/T is given below..

From the graph, slope = -7007.6

For the Clausius clapeyron equation, slope = - delta H_vap/R

Value of R is 8.314 J/K.mol

-7007.6 = -  delta H_vap/8.314

delta H_vap = 7007.6 x 8.314 = 58261.1864 J/mol or 58.3 kJ/mol

(3) percent error = [(measured - actual)/actual]*100

percent error = [(58.3 - 38.6)/38.6]*100 = 51.0%