Question

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1)

Consider the vaporization of liquid water to steam at a pressureof 1 atm.

a) At what temperature are the two phases in equilibrium?T=?

2)

How does the entropy of the system change in the followingprocesses?
(a) the melting of ice cubes at 10 ?C and 1 atm pressure;
(b) separating a mixture of N2 and O2 into two separate samples,one that is pure N2 and one that is pure O2;
(c) alignment of iron filings in a magnetic field;
(d) the reaction of sodium metal with chlorine gas to form sodiumchloride;
(e) the dissolution of HCl(g) in water to formconcentrated hydrochloric acid.

3)

From the values given for?H? and ?S? ,calculate ?G?for each of the following reactions at 298K.

a)2PbS(s)+3O2(g)?2PbO(s)+2SO2(g);?H?=?844kJ; ?S?=?165J/K

b) 2POCl3(g)?2PCl3(g)+O2(g);?H?=572kJ; ?S?=179J/K

c) If the reaction is not spontaneous under standard conditionsat 298 K, at what temperature (if any) would the reaction becomespontaneous? If there is no answer enternone.

4)

Consider thereaction3CH4(g)?C3H8(g)+2H2(g).

a) calculate ?G? at 298 K.Express your answer using four significantfigures.

b) Calculate ?G at 298 K if the reaction mixtureconsists of 41atm of CH4, 0.015atm of C3H8, and 1.9