A gas is confined to a cylinder under a constant atmospheric pressure of 1 atm,

Question

A gas is confined to a cylinder under a constant atmospheric pressure of 1 atm, as illustrated. The initial volume is 4.0 L and the temperature is 300 K. The gas undergoes a chemical reaction; at the completion of the reaction the final volume is 3.0 L and the final temperature is 290 K. Which of the following statements correctly describes the changes in the system? Work was done on the system and Delta H for the reaction is positive. Work was done by the system and Delta H for the reaction is positive. Work was done by the system and Delta H for the reaction is negative. Work was done on the system and there was no enthalpy change. Work was done by the system and the sign of Delta H cannot be determined.

Explanation / Answer

A work done on the system and delta H is positive.both satisfied the above observation

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