The apparatus shown here is used to measure the vapor pressure of ethylene diamine. The system is loaded with pure ethylene diamine and the bath is adjusted to each of several known temperatures. The following readings are taken on a day when the atmospheric pressure is 758.9 mm Hg: Merwry Level T(QC) Right Arm (mm) Left Arm (mm) 42.7 138 862 58.9 160 840 68.3 182 818 77.9 213 787 88.6 262 738 98.3 323 677 105.8 383 617
Thermodynamics and Thermochemistry Summary Terms and definitions: H (enthalpy) is the change in heat at a constant temperature 1. If delta H is positive heat is taken away from the surroundings and it is considered exothermic 2. I delta H is negative, heat is given/added to the surroundings and I is considered exothermic S (entropy) is the change in randomness or how spontaneous it is 1. If S > 0, then there is an increase in randomness. This is thermodynamically favored 2. If S < 0, then there is a decrease in randomness. This is NOT thermodynamically favored G (Free Energy change) – relates to ideal work from reaction and it CANNOT be
