Homework Help: Adiabatic Compression - Graphs

1. Nov 1, 2009

icecube

1. The problem statement, all variables and given/known data
Consider an adiabatic chemical reaction which results in the system being compressed. Assume an infinitely large surrounding.
Draw a pressure-volume plot for the process. Indicate the points corresponding to your final and initial volumes o the plot. Indicate at which point(s) the pressure of the system in in equilibrium with the surroundings.

Draw a temperature-volume plot for the process. Indicate the points corresponding to your final and initial volumes o the plot. Indicate at which point(s) the temperature of the system in in equilibrium with the surroundings.

3. The attempt at a solution

I basically drew an inverse curve like this, and labeled the right-most point as the initial volume, and left most as the final volume.I do not know where the pressure would be at equilibrium though :|. Would it just be when the reaction is completed, so at the left-most points?

I did the same for the temperature-volume plot, since it was hinted that the plot would be similar to the pressure-volume plot. But again, I do not know where it would be at equilibrium. I feel like it would depend on the surroundings.

1. The problem statement, all variables and given/known data
Explain why the following statement is true: "Assuming that the system was in thermodynamic equilibrium prior to the chemical reaction, no point on the pressure-volume plot corresponds to the pre-reaction system."

3. The attempt at a solution
I thought this is true just because the pressure-volume plot would have a different initial volume so it wouldn't be the same as the pre-reaction system. I'm really not sure where to go with this.

Last edited: Nov 1, 2009