Part A A block of copper of unknown mass has an initial temperature of 67.4 °C. The copper is immersed in a beaker containing 92.4 g of water at 22.9 °C. When the two substances reach thermal equilibrium, the final temperature is 25.0 °C. What is the mass of the copper block? Assume that Cs, H₂O = 4.18 J/(g. °C) and Cs, Cu = 0.385 J/(g. °C). Express the mass to two significant figures and include the appropriate units. m = 4.637 Submit Previous Answers Request Answer ? X Incorrect; Try Again; 7 attempts remaining The value you have entered for mass indicates that you assumed that water and copper have the same specific heat. However, the specific heat of copper is given, and it is at least an order of magnitude lower than that of water (also given). Therefore, the mass of copper should be at least an order of magnitude greater than the mass you calculated. Make certain you account for the specific heat (Cs) of each substance when substituting values according to the relationship between heat and heat capacity: q = mx Cs x AT.

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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.