Part A What is the change in entropy of 370 g of steam at 100 C when it is conde

Question

Part A What is the change in entropy of 370 g of steam at 100 C when it is condensed to water at 100 C? Express your answer to two significant figures and include the appropriate units.

An ideal gas expands at a constant total pressure of 3.3 atm from 460 mL to 850 mL . Heat then flows out of the gas at constant volume, and the pressure and temperature are allowed to drop until the temperature reaches its original value.

Part A

Calculate the total work done by the gas in the process.

Express your answer to two significant figures and include the appropriate units.

Part B

Calculate the total heat flow into the gas.

Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

(A).Mass m = 370 g

Temperature of the steam T = 100 oC = 100 + 273 = 373 K

Latent heat of vaporisation L = 540 Cal / g

Change in entropy dS = mL / T

                                = (370 x 540 ) / 373

                                = 535.65 cal / K

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