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m.edu/bbeswebdav/pid- 0965 learn.unm.edu/bbcswebdav/pid-308227 Browse Playlists TED O ALEKS THERMOCHEMISTRY 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 cylin The temperature of the water bath is monitored, and it is determined from this data that 327. kJ of heat flows into the system during the reaction. The position of the piston is also monitored, and it is determined from this data that the system does 168. kJ of work on the piston during the reaction. gases exothermic 10P ts the reaction exothermic or endothermic? Oup Does the temperature of the water bath go up or down? O neither in Oout O absorb Oneither Does the piston move in or out? Does the reaction absorb or release energy release How much energy does the reaction absorb or release? Be sure your answer has the correct number of significant digits. kJ Explanation

Explanation / Answer

1.

SInce energy is transferred into the system, it is an endothermic reaction.

2.

Since heat is absorbed by the system, the temperature of water will be down.

3.

Since work is done by the system, iston moves out.

4.

Absorb heat

5.

deltaU = q + w = 327 - 168 = 159 kJ

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