20) Vapor pressure In simplification, the relation between the vapor pressure and temperature of a pure substance can be described by the August equation (for the pressure p in bar and the temperature T in Kelvin) as follows: In(p) = A - -/- Hereby, the heat of vaporization is assumed to be independent of the temperature and A and B are experimentally determined constants. a) Describe the term vapor pressure! b) Explain why most solid substances exhibit a very low vapor pressure. In contrast, give an example of a solid with a significantly high vapor pressure. c) Using the August equation, determine the temperature and pressure of the triple point of sulfur dioxide (SO2). For solid SO2, the constants of the August equation are determined to be A = 15.901 and B = 3883 K-¹. For liquid SO2 the parameters are A = 11.401 and B = 2995 K-¹.
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
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