\"Graph the following data for vapor pressure of ammonia using excel or another

Question

"Graph the following data for vapor pressure of ammonia using excel or another computer program and from the graph determine the heat of vaporization and the normal boiling point for NH3"
Temperature in Kelvins            Vapor Pressure (Torr)
200                                             65.3
210                                            134.3
220                                             255.7
230                                             456
235                                             597

Assuming the equation ln(Vapor Pressure) = molar heat of vaporization/R(1/Temperature)+C, I got a linear approximation of the curve as y=.564x+3.734, with y=ln(Vapor Pressure) and x=1/Temperature, but this gives me values for molar heat of vaporization and normal boiling point that seem way off and too small. I should be getting something around 240-something K for boiling point right?

Explanation / Answer

actually the error is : the slope of line is :

ln (134.3) - ln(65.3) /(1/210 - 1/200) = -3028.553
So it should be y = -3028.553x + c

where you would be able to find c , so thats where the error is , Please rate

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