A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1 atm. The cylinder is also submerged in a large insulated water bath. (See sketch at right.) 1 atm pressure piston cylinder From previous experiments, this chemical reaction is known to release 335. kJ of energy. water bath gases The position of the piston is monitored, and it is determined from this data that the piston does 319. kJ of work on the system during the reaction. exothermic Is the reaction exothermic or endothermic? O endothermic O up Does the temperature of the water bath go up or down? O down O neither O in Does the piston move in or out? O out O neither O in Does heat flow into or out of the gas mixture? out O neither How much heat flows? Round your answer to 3 significant digits. o o
A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1 atm. The cylinder is also submerged in a large insulated water bath. (See sketch at right.) 1 atm pressure piston cylinder From previous experiments, this chemical reaction is known to release 335. kJ of energy. water bath gases The position of the piston is monitored, and it is determined from this data that the piston does 319. kJ of work on the system during the reaction. exothermic Is the reaction exothermic or endothermic? O endothermic O up Does the temperature of the water bath go up or down? O down O neither O in Does the piston move in or out? O out O neither O in Does heat flow into or out of the gas mixture? out O neither How much heat flows? Round your answer to 3 significant digits. o o
Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter5: Gases
Section: Chapter Questions
Problem 78QAP
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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.
Question
Transcribed Image Text:A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The
cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1 atm. The
1 atm pressure
piston
cylinder is also submerged in a large insulated water bath. (See sketch at right.)
cylinder
From previous experiments, this chemical reaction is known to release 335. kJ of energy.
water bath
The position of the piston is monitored, and it is determined from this data that the piston does 319. kJ of work on the
gases
system during the reaction.
exothermic
Is the reaction exothermic or endothermic?
х10
endothermic
up
?
Does the temperature of the water bath go up or
down?
down
neither
in
Does the piston move in or out?
out
neither
in
Does heat flow into or out of the gas mixture?
out
neither
How much heat flows? Round your answer to 3
O kJ
significant digits.
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