- #1
senan
- 18
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Homework Statement
(1a) What are the total change in energy and entropy if 250 g of water at 20◦C is heated
and vaporised to yield 250 g of steam, all at atmospheric pressure?
(1b) Find the change in the entropy of 250 g of liquid water at its boiling point when it is
vaporised at a pressure of 8 atm. Give a brief physical explanation for how this entropy
change compares with the entropy change for vaporisation at 1 atm pressure.
(1c) We can allow for a possible transition between two phases of a substance by adding
the term +μdN in the fundamental thermodynamic relation for dE. Derive the condition
for equilibrium between two phases at a fixed temperature and pressure.
Homework Equations
The Attempt at a Solution
1(a) S2-S1 = mC Integral form T1 to T2 of (dT/T) + Latent heat of transformation/373.15K
The latent heat wasn't given in the question so I'm wondering how to get around using it
1(b)
i was thinking of using S2-S1 = (1/T) integral from 1 to 2 of PdV but i can't figure how to eliminate the volume
1(c)
i don't have anything for this