the d of heat and work A mix cylinder has a piston that moves in or out, as nece

Question

the d of heat and work A mix 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.) of the water bath is monitored, and it is determined from this data that 132. 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 piston does 177. kJ of work on the system during the reaction. O up O in O neither kJ

Explanation / Answer

(i) Since the heat flows out of water bath that means the q is negative and it represents an exothermic reaction.

(ii) Heat flows out from the system to the surroundings (water bath and veseel) and hence the water bath temperature goes up.

(iii) Since the work, w is positive that means the work done on the system and hence the piston will move in.

(iv) W is positive it means the work is done on the gas system.

(v)

delta E = 132 kJ

q = -177 kJ

from first law of thermodynamics,

delta E = q + w

delta E - q = w

132 kJ - (-177 kJ) = w

w=309kJ

So, 309 kJ of work is done on the gas mixture.

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