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 The temperature of the water bath is monitored, and it is determined from this data that 344. kJ of heat flows out of the system during the reaction. The position of the piston is also monitored, and it is determined from this data that the system does 271. kJ of work on the piston during the reaction. water bath gases 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 absorb Does the reaction absorb or release energy? O release O neither How much energy does the reaction absorb or release? Be sure your answer has the correct number 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
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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O THERMOCHEMISTRY
3/5
Understanding the definitions of heat and work
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
The temperature of the water bath is monitored, and it is determined from this data that 344. kJ of heat flows out of the
water bath
system during the reaction. The position of the piston is also monitored, and it is determined from this data that the
system does 271. kJ of work on the piston during the reaction.
gases
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 absorb
Does the reaction absorb or release energy?
O release
O neither
How much energy does the reaction absorb or
release? Be sure your answer has the correct
number of significant digits.
II
Transcribed Image Text:O THERMOCHEMISTRY 3/5 Understanding the definitions of heat and work 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 The temperature of the water bath is monitored, and it is determined from this data that 344. kJ of heat flows out of the water bath system during the reaction. The position of the piston is also monitored, and it is determined from this data that the system does 271. kJ of work on the piston during the reaction. gases 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 absorb Does the reaction absorb or release energy? O release O neither How much energy does the reaction absorb or release? Be sure your answer has the correct number of significant digits. II
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