hixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The nder 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 nder is also submerged in a large insulated water bath. (See sketch at right.) cylinder m previous experiments, this chemical reaction is known to release 228. kJ of energy. water bath temperature of the water bath is monitored, and it is determined from this data that 255. kJ of heat flows into the gases tem during the reaction. O exothermic the reaction exothermic or endothermic? O endothermic O up es the temperature of the water bath go up or wn? O down O neithen O in es the piston move in or out? O out O neither O does work es the gas mixture do work, or is work done it? O work is done on it O neither w much work is done on (or by) the gas kture? Be sure your answer has the correct mber of significant digits.

hixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The nder 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 nder is also submerged in a large insulated water bath. (See sketch at right.) cylinder m previous experiments, this chemical reaction is known to release 228. kJ of energy. water bath temperature of the water bath is monitored, and it is determined from this data that 255. kJ of heat flows into the gases tem during the reaction. O exothermic the reaction exothermic or endothermic? O endothermic O up es the temperature of the water bath go up or wn? O down O neithen O in es the piston move in or out? O out O neither O does work es the gas mixture do work, or is work done it? O work is done on it O neither w much work is done on (or by) the gas kture? Be sure your answer has the correct mber of significant digits.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter5: Gases

Section: Chapter Questions

Problem 175MP

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Concept explainers

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

A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The
1 atm pressure
cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1 atm. The
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 228. kJ of energy.
water bath
The temperature of the water bath is monitored, and it is determined from this data that 255. kJ of heat flows into the
gases
system during the reaction.
O 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 does work
Does the gas mixture do work, or is work done
on it?
O work is done on it
O neither
How much work is done on (or by) the gas
mixture? Be sure your answer has the correct
number of significant digits.

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