ystem The relationships between Hsstem and Ssurroundings at constant temperature

Question

ystem The relationships between Hsstem and Ssurroundings at constant temperature (ASsurroundings- thermodynamics in more useful quantities allow us to rewrite and rearrange the 2nd law of for Sun) (substitute-T (multiply through by-T and rearrange) -TAS,ni = ,ya-TASay8 Given that the Gibbs Free Energy Change, AG, is We obtain the very important and useful equation that allows us to predict spontaneity sys Commonly written as: G- 1-TAS When starting with Standard State Conditions: no- r-TAS Part C Click and drag the correct answers Refer to the Second Law of Thermodynamics Temperature, T is alwavs measured in Kelvin, what is the sign of T? What is the sign of ASun for a spontaneous process? What is the sign of ASuniv for a nonspontaneous process? What is the value of ASuny for a system at equilibrium? positive negative zero Consider the signs of T and ASuniv (from above) and the equation: G =-TASuniv it depends what sign for G indicates a spontaneous reaction? what sign for G indicates a nonspontaneous reaction? what value of G indicates a system at equilibrium?

Explanation / Answer

Q1

a)

if T is in Kelvin, then T > 0, tha tis, always positive

b)

dSuniverse for a spontanoue process --> must increase, so dS is positive

c)

dSuniverse for nonspontanoue --< msut decrease, so dS = negative

d)

dSuniv in equilbirium, must have 0 balance

Q2

now..

dsuniv for:

a)

Sign of dG for spotnaneous process --> dG must be negative

b)

sign for dG nonspontanoeus --> dG must be positivie

c)

asstated before, dG = 0 both cases, so equilbirium is present

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