Question

Chemists sometimes carry out reactions in liquid ammonia as a solvent. With adequate safety protection, these reactions can be done at temperatures above ammonia's boiling point in a sealed, thick-walled glass tube. If the reaction is being carried out at 22 °C, what is the pressure of ammonia inside the tube? Vapor pressures of NH3 () at several temperatures are given in the table below. Temperature (°C) Vapor Pressure (atm) -68.4 0.132 0.526 45.4 1.000 -33.6 2.00 -18.7 5.00 4.7 25.7 10.00 20.00 50.1 Pressure atm

Answer 1

The positive values ​​of the table are plotted, which approach a linear behavior and we have:

Temperature Vapor Pressur Vapor Pressure 4,7 5 25,7 10 25 50,1 20 y 0,3325x2,7439 20 15 Vapor Pressure 10 Lineal (Vapor Pressure) 5 0 60 40 20 LC

Where the equation of the line:

Y = 0.3325 * X + 2.7439

The vapor pressure at 22 ° C is calculated:

Y = (0.3325 * 22) + 2.7439 = 10,060 atm

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