1. The melting point of water is 0°C at 1 atm pressure because under these condi

Question

1. The melting point of water is 0°C at 1 atm pressure because under these conditions:

Select one:

a. DeltaS for the process H2O(s) --> H2O(l) is positive.

b. Delta S and Delta Ssurr for the process H2O(s) --> H2O(l) are both positive.

c. Delta S and Delta Ssurr for the process H2O(s) --> H2O(l) are equal in magnitude and opposite in sign.

d. Delta G is positive for the process H2O(s) --> H2O(l).

e. None of these is correct.

2. Which of the following reactions will have a positive value of Delta S°?

I. Pb(s)   +   Cl2(g) --> PbCl2(s)
II. 2H2S(g)   +   3O2(g) --> 2H2O(g)   +   2SO2(g)
III. K2SO4(s) --> 2K+(aq)   +   SO42-(aq)

Select one:

a. I only

b. II only

c. III only

d. I and II

e. II and III

please answer the questions above and explain! thank you!

Explanation / Answer

1. c. Delta S and Delta Ssurr for the process H2O(s) --> H2O(l) are equal in magnitude and opposite in sign.

because, conversion of H2O(s) --> H2O(l) gives DSsys = +ve, Dssurr = -ve, but over all DSuniv = +ve,

so that it is feasible at this conditions.

2. answer: c. III only

because, in III. equation , 1 mol solid , converts into 2 mol of aqueous ions.results increase in entropy. but in other two it is decreases.

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