For each system listed in the first column of the table below, decide (if possible) whether the change described in the second column will increase the entropy S
of the system, decrease S, or leave S unchanged. If you don't have enough information to decide, check the "not enough information" button in the last column.
Note for advanced students: you may assume ideal gas and ideal solution behaviour.
System
Change
?S
A mixture of nitrogen (N?) gas and
carbon dioxide (CO?) gas at 3 atm
and -3°C
An additional 2.0 L of pure CO?
gas is added to the mixture, with the
pressure kept constant at 3 atm
? ?S < 0
? ?S = 0
? ?S > 0
? not enough
information
A solution made of ammonium
chloride (NH?Cl) in water, at
83°C
50 mL of pure water is added to
the solution
? ?S < 0
? ?S = 0
? ?S > 0
? not enough
information
300 mL of a solution made from
ammonium chloride (NH?Cl)
dissolved in water.
0.5 g of NH?Cl crystallizes out of
the solution, without changing the
temperature
? ?S < 0
? ?S = 0
? ?S > 0
? not enough
information
