Recent content by kalbuskj31

Hopefully somebody can help me with this. I have a final exam next week, and the textbook we use along with my professor didn't do a good job explaining what happens in irreversible reactions. More specifically, what differences are there between reversible and irreversible processes of...

Homework Statement A piece of Copper, consisting of 1 mole, is quenched rapidly from 525oC into a water bath at 25oC. Calculate \DeltaS for the Copper and the water bath. Assume that Copper has a constant Cp of 25 J/K and that the water bath is so large (infinitely), that its temperature...

Thanks for the help. It took me awhile to understand everything, but I was able to get the correct answers. The material is so dense that sometimes you forget some of the simplest steps.

Homework Statement A reversible hear engine, operating in a cycle, withdraws heat from a high temperature reservoir (temperature consequently decreases). It performs work w, and rejects heat into a low-temperature reservoir(temperature consequently increases). The 2 reservoirs are...

Homework Statement Calculate q, w, ΔH, ΔU, ΔS for the following problem: One mole of a monatomic ideal gas starting at 300K, and 10 atm, the gas freely expands into a vacuum to triple its volume. Homework Equations w = PΔV, ΔU = q - w or Cv dT, ΔH = ΔU + PΔV or Cp dT, ΔS =...

Homework Statement 2 moles of an ideal gas, P1 = 10 atm V1 = 5L, are taken reversibly in a clockwise direction around a circular path given by (V-10)^2 + (P-10)^2 = 25. All I have left to solve for is the minimum temperature. Homework Equations PV = nRT The Attempt at a Solution...

Thanks, I did some alegbra incorrectly and stumbled across something that I found very very unusual. Is it safe to assume what I found is a rare coincidence?

I was able to find work by figuring out the area under the curve. The solution that I found for q baffles me. This question was the last part of a series of state changes in a cyclic reaction. I found the answer by adding the q and subtracting w from the previous parts of the problem. That...

Thank you for the help. the graphical interpretation helped give me the correct answer. I've been out of school for 3 years, so I'm brushing up on everything.

Thanks. Can you please explain why this process isn't considered isothermal?

andrew, That's what I ended up doing to get the answer.

Homework Statement 1 mole of monatomic ideal gas. P1 = 2 atm V1 = 44.8 L T1 = 1092 K. The path to P2 = 1 atm V2 = 22.4 L and T2 = 273K is P = 6.643E-4 * V^2 + 2/3. Calculate the heat and work. Homework Equations q = nCpΔT w = PΔVThe Attempt at a Solution I attempted to directly plug in the...

Homework Statement 10 moles of an ideal gas, in the initial state P1 = 10 atm, T1 = 300K are taken around the following cycle. a) A reversible change of state along a straight line path on the P-V diagram to the state P = 1 atm T = 300K. How much work is done during the cycle...

Thanks for taking a look at the problem Gear300. The problem I found with my logic is that P, V, and T all are changing from state 1 to state 2 so I have to use the Internal Energy formula reversing the temperature. (i.e. Ti - Tf).

Homework Statement An Ideal Gas at 300K has a volume of 15L and a pressure of 15 atm. Calculate the change when the system goes under a reversible adiabatic expansion to a pressure of 10 atm. Gamma = 5/3. Cv = 1.5R. q = 0(definition of adiabatic processes).Homework Equations dw = P DV...