1.378 g of a solid substance at 22.3°C is heated up. Selected thermochemical data for the substance are given below. Substance: AHfusion - 134.9 J/g AHvap = 563 J/g a. Draw the phase change diagram for the substance between 22.3 °C and 118.4 °C. Label the heat change and temperatures for each segment of the diagram. You will first need to show your calculations on the heat required for each phase and phase change in the diagram. Melting point = 52.3°C Boiling point -118.4°C Csolid = 0.936 J/g°C Cliquid-1.15 J/gºC b. What is/are the phase(s) of the substance after 50.0 J of heat input? c. What is the temperature of the substance after 50.0 J of heat input?
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
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