The following data give the vapor pressure of water at various temperatures. Transform the data, using ln (P) for the dependent variable and 1/T for the independent variable. Carry out the linear least-squares fit by hand, calculating the four sums. Find the molar enthalpy change of vaporization.

Temperature (^◦C)                         Vapor pressure (Torr)
0 ....................................................................................4.579
5 ....................................................................................6.543
10 ..................................................................................9.209
15 ................................................................................12.788
20 ................................................................................17.535
25 ................................................................................23.756