Charles . Recitation 7 , -) ? fi https://learn.vccs.edu/bbcswebdav/pid-114991363

Question

Charles . Recitation 7 , -) ? fi https://learn.vccs.edu/bbcswebdav/pid-114991363-dt-content-rid-243578636-2/courses/GC297.CHM.112.w01.SU18/GC297.CHM.112.W01.SU...Q?|q- :: Apps Online Banking-Un D Credit Card Accoun: LG HOME-myGCC LG HOME-myNVCC * Late Nite Labs Course selected, pl ?VCU-Central Authe G FOREVER CHORDS b Recitation 7 41 6 under standard state conditionsPco 1atm)? Briefly explain your answer 3. a) For the reaction KC (s)KCI (aq), state whether the entropy of the system increases or decreases. Explain your reasoning b) The temperature of the solution is slightly lower after1 mole of KCl dissolves. fact indicate about the enthalpy of this process? What does this 4. Thermodynamic data for Crphite) and Cor) at 298 K is given in the table below AH Is*(J/mol K) (KJ/mol) 5.740 1.895 2.377 a) Calculate H and AS and AG for the transformation of one mole of graphite to diamond at 298 K b) Is there a temperatureat which this transformation will occur spontaneously at atmospheric pressure? Justifyyour answer

Explanation / Answer

Ans 3

Part a

The reaction is

KCl (s) - - - - > KCl (aq)

Entropy of the system increases.

Solid KCl is converted into liquid phase. Entropy of the substance increases when solid converted into liquid and decreases when liquid converted into solid

Part b

Temperature of the solution decreases on dissolving 1 mol of KCl, it means energy is absorbed during the process.

When the energy is absorbed, the reaction is endothermic.

Enthalpy change for the reaction is positive.

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