Macmillan Learning The graph shows a heat curve for an unidentified substance discovered by the Mars rover. Temperature (°C) Tfusion = Tvapor 400- 380 - 360 340 320 300 280 260 240 220- 200 180 160 140 120 100- 80 60 40 20 Q = 0- = -20- -40 -60- -80- What is the temperature of fusion, Tfusion, of the substance? 40 80 What is the temperature of vaporization, Tvapor, of the substance? Heat (J) 120 Given a 86.6-g sample of this substance with a specific heat of 50.6 J/(kg-°C), how much heat is required to change its temperature from 180.0 °C to 226.0 °C? °C °C J
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.
We are given a heating curve for unknown substance found on mars. We need to calculate its melting and boiling points and heat required to raise its temperature from 180.0 °C to 226.0 °C.
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