What, if anything, can you conclude about the signs of ASsys and ASsurr in each

Question

What, if anything, can you conclude about the signs of ASsys and ASsurr in each spontaneous process showrn below? H2O(l) H2O(g) Pb"(aq) Cl-(aq) PbCl2(s) a. c. + O ASsys and ASsurr are both + ASSys and Ssurr are both- ASsys and ASsur are both + ASsys and Ssur are both- ASsys is + and Ssurr is- ASsys is _ and Ssur is + ASsys is-but Ssurr could be either + or- O ASsys is + but Ssur could be either + or- ASsys is _ and Ssurr is + ASsys is-but Ssurr could be either + or- ASsys is + but Ssur could be either + or-

Explanation / Answer

a. A liquid is converted to a gas. So, S sys = '+' Ve.

As, Heat is extracted by the system from the surrounding S surr = '-' Ve.

b. Two gases combine to give a solid. So, S sys = '-' Ve.

As, Heat is released by the system to the surrounding S surr = '+' Ve.

c. A solid is formed by reaction of two aqueous ions. So, S sys = '-' Ve.

As, Heat is released by the system to the surrounding S surr = '+' Ve.

d. A solid is dissolved into a solution. So, S sys = '+' Ve.

As, Heat is extracted by the system from the surrounding S surr = '-' Ve.

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