applications of hess's law of constant heat summation
Hess's law Hess's law is now understood as an expression of the principle of conservation of energy, also expressed in the first law of thermodynamics, and the fact that the enthalpy of a chemical process is independent of the path taken from the initial to the final state (i.e. enthalpy is a state function). Reaction enthalpy changes can be determined by calorimetry for many reactions. The values are usually stated for processes with the same initial and final temperatures and pressures, although the conditions can vary during the reaction. Hess's law can be used to determine the overall energy required for a chemical reaction, when it can be divided into synthetic steps that are individually easier to characterize. This affords the compilation of standard enthalpies of formation, that may be used as a basis to design complex syntheses.
In the Heat of the Night (Ray Charles song) "In the Heat of the Night" is a 1967 song performed by Ray Charles, composed by Quincy Jones, and written by Marilyn Bergman and Alan Bergman for the film In the Heat of the Night. As Matthew Greenwald of AllMusic states, the song "opens the film and accompanying soundtrack with a slice of real, rural backwoods gospel. Lyrically, one of the key lines is 'In the heat of the night/I'm feeling motherless somehow,' which clearly illustrates the main character's dilemma of being in the wrong place at the wrong time. The main melody is guided by Charles' funky piano work and is buttressed by then-session ace Billy Preston's powerful, soulful organ trills. The underlying sense of drama that is so much a part of the film is reflected perfectly in this song, and the Ray Charles Singers add to this with a stately grace. It's perfect listening for a midsummer night when the temperature is just a bit too hot for comfort."[1]