3. After you close the hatch on the international space station, the airlock reg

ID: 788329 • Letter: 3

Question

3. After you close the hatch on the international space station, the airlock region is a

nearly perfect vacuum, so you need to start refilling that region with air. Suppose that

you do so by opening up a 10.0 liter tank of 5.00 atm air, allowing the air to expand so

that it now takes up a total volume (tank+ airlock) of 2000 liters. Take the air to be an

ideal gas and assume that the process is isothermal (carried out at constant temperature).

What are q and w for this process? What would qrev and wrev have been for the same net

change? Give all of your answers in kJ.

4. A 111.7 g piece of iron is moved from a beaker of boiling water into 1000 gallons of

really cold liquid water (0.00oC). What is ?S for the iron for this process? What is ?S

for the water? Assume the pressure p = 1.00 atm.

Use the following equations

P1V1 = P2V2

P1/P2 = T1/T2

P1 = 5 atm, P2 = 1 atm

V1 = 10 litre, V2 = 2000 litre

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