Which of the following has the lowest value of absolute entropy per mole? Conditions are as defined in each case

A) solid sodium at 30 oC
B) gaseous sodium at 900 oC and 0.5 atm
C) gaseous sodium at 900 oC and 1 atm
D) liquid sodium at 100 oC
E) a solid solution of sodium in potassium at 30oC

1 Answer
anor277
May 18, 2018

Do you agree that the condensed phase, should have the LOWEST associated entropy?

Explanation:

Solid phases are clearly more ordered than liquid phases, which are CLEARLY more ordered than gaseous phases...

So you got choices between #A# and #E#...Now there are TWO components in the alloy (and in fact this alloy is widely used in synthesis as a LIQUIDUS....not A SOLID)...but given the single component of #A#...this CLEARLY has the LEAST ENTROPY, THE LEAST STATISTICAL PROBABILITY FOR DISORDER...

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