- #1

MattHorbacz

- 18

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## Homework Statement

Two rigid, insulated tanks are connected with a pipe and valve. One tank has 0.5 kg air at 200 kPa, 300 K and the other has 0.75 kg air at 100 kPa, 400 K. The valve is opened, and the air comes to a single uniform state without any heat transfer. Find the final temperature and the change in entropy of the air.

## Homework Equations

ds=Cv*ln(T2/T1)+R*ln(v2/v1)

PV=nRT

m

_{1}c

_{v}ΔT

_{1}=-m

_{2}c

_{v}ΔT

_{2}

?

## The Attempt at a Solution

I am pretty lost. I solved for the total volume, mass, and specific volume, but have no idea how to solve for temperature. And I thought that there was no change in entropy without heat transfer. Even showing me what equations to use would be extremely helpful

Edit: just remembered that q_tank1=-q_tank2: m1c_vΔT1=-m2c_vΔT2. Solved for final temp to be 360 K

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