Tuesday
March 31, 2015

Homework Help: Thermodynamics

Posted by Becca on Saturday, February 23, 2013 at 11:21pm.

The initial state consists of a closed system containing one mole of super-heated liquid water at 115C and 1 atmosphere pressure. The immediate surroundings are also at 115C and 1 atmosphere pressure.

The change in state is described as this one mole of super-heated liquid water vaporizing to water vapor at 115C, as shown by the following reaction at 1 atmosphere pressure.

1 mole, H2O, liquid, 115C ---> 1 mole, H2O, vapor, 115C

a) Calculate the Enthalpy change for the system at 115C.
b) Calculate the Entropy change for this system at 115C.
c) Assuming that the surroundings behave as a constant temperature reservoir,
calculate the Enthalpy change for the surroundings
d) Assuming that the surroundings behave as a constant temperature reservoir,
calculate the Entropy change for the surroundings
e) Calculate the Entropy change for the universe.

Given the following:
Cp (liquid) = 75.33 J/mole K,
Cp (vapor) = 37.47 J/mole K,
∆H vaporization (100C) = 40790 J/mole

I really have no idea what to do or where to start. I know I need to break the problem down into steps but I'm not sure exactly how to split it up.

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