A balanced, generic thermochemical equation is shown below. A, B, and C are substances involved in the reaction. The energy written in the equation is a value of ΔH. Show all work. 2A +3B+42kJ ---> 1C c) If 50.0 g of A is reacted in the presence of excess B, how much heat is transferred by the reaction? Take the molar mass of A to be 78.70 g/mol. d) Suppose the heat from part (c) is transferred directly to/from 100.0 grams of water held in a separate container. Cs (water) = 4.184 J/(g∙°C). i) Draw a schematic diagram of the experiment. I am looking for the direction of heat flow between the two entities in your "universe." ii) Calculate the ΔT of the water. Make sure to include the sign of ΔT. If you were not able to solve part (c), assume that qrxn = −25 kJ. iii) Briefly explain (in about 1 sentence) why your result from part d(ii) makes physical sense.
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.
A balanced, generic thermochemical equation is shown below. A, B, and C are substances involved in the reaction. The energy written in the equation is a value of ΔH. Show all work.
2A +3B+42kJ ---> 1C
c) If 50.0 g of A is reacted in the presence of excess B, how much heat is transferred by the reaction? Take the molar mass of A to be 78.70 g/mol.
d) Suppose the heat from part (c) is transferred directly to/from 100.0 grams of water held in a separate container. Cs (water) = 4.184 J/(g∙°C).
i) Draw a schematic diagram of the experiment. I am looking for the direction of heat flow between the two entities in your "universe."
ii) Calculate the ΔT of the water. Make sure to include the sign of ΔT. If you were not able to solve part (c), assume that qrxn = −25 kJ.
iii) Briefly explain (in about 1 sentence) why your result from part d(ii) makes physical sense.
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